Across
Insisted on personal pieces, initially at a loss (5,2,4,4)
Rather greasy seafood with a dry stuffing (7)
I haven't cracked this one yet — but Fifteensquared have:
An envelope (‘with … stuffing’) of ‘a’ plus TT (teetotal, ‘dry’) in FISH (‘seafood’).
A knight in royal household running for herald (7)
I haven't cracked this one yet — but Fifteensquared have:
An envelope (‘in’) of ‘a’ plus N (‘knight’, chess notation) in COURT (‘royal household’); in the definition, a ‘herald’ is someone who knows about heraldry.
Nature trail (3)
We dig and unearth a potty (3,8)
Hero on overseas trip books event for players (10)
Kind of word sent round in brief note (4)
Path commentator's travelled up (4)
Dissatisfied fellow delivered a lecture on corruption (10)
I haven't cracked this one yet — but Fifteensquared have:
A charade of F (‘fellow’) plus RUST (‘corruption’) plus RATED (‘delivered a lecture’).
Advanced tips on better information technology for businessmen (11)
Part of boot from West? (3)
I haven't cracked this one yet — but Fifteensquared have:
TO E (‘from West’).
Plants unknown in drained area beside meadows (7)
I haven't cracked this one yet — but Fifteensquared have:
An envelope (in’) of Z (mathematical ‘unknown’) in AA (‘drained A re A ‘) plus (‘beside’) LEAS (‘meadows’).
Anticipate Macron's ready to accommodate English politician (3-4)
I haven't cracked this one yet — but Fifteensquared have:
An envelope (‘to accommodate’) of E (‘English’) plus MP (‘politician’) in PRET (‘Macron’s ready’).
Investigator's prime article that may upset diplomatic aide (8,7)
I haven't cracked this one yet — but Fifteensquared have:
An anagram (‘upset’) of I (‘ I nvestigator’s prime’) plus ‘article that may’.
Down
Worst fate potentially encountered in bath? (4,5)
First 20 letters broadcast not my choice? (2,2,3)
Ulster Times introduced to man on board craft (8)
I haven't cracked this one yet — but Fifteensquared have:
An envelope (‘introduced to’) of NI (‘Ulster’; as usual, Northern Ireland is only loosely equivalent, in that Ulster is in the north of the island Ireland, but it is too useful for crossword setters to give it up) plus T T (‘times’) in KING (‘man on board’, chess).
Drag, shifting old pigment (5)
I haven't cracked this one yet — but Fifteensquared have:
CHORE (‘drag’) with the O moved (‘shifting old’).
Audibly criticise acts providing night music (9)
Decent honest Conservative? (6)
Contrasting articles from Paris and London on 'love in moderation' (7)
I haven't cracked this one yet — but Fifteensquared have:
A charade of UN A (‘articles from Paris and London’) plus LIKE (‘love in moderation’).
Determined to attack (3,2)
Preacher's spoken, boring Scrooge (9)
Convertible seating poorly tested within working group (3,6)
Regularly curved track? (8)
Regal killer has right implement lying around (7)
I haven't cracked this one yet — but Fifteensquared have:
A charade of ASP (‘regal killer’, following the popular legend – and Shakespeare – that Cleopatra died by allowing an asp to bite her) plus R (‘right’) plus AWL (‘instrument’).
Venerable revolutionary I satisfied in bed (7)
I haven't cracked this one yet — but Fifteensquared have:
A reversal (‘revolutionary’) of an envelope (‘in’) of I MET (‘I satisfied’) in COT (‘bed’)
Sturdy plant blocking stone path (6)
Rent such as minister retains (5)
Tint of marine coats particularly intense at first (5)
Type letters or click words in the clue