Across
Anger gripping almost all in French train (9)
Impudent, but shy about certain knowledge at first (5)
I haven't cracked this one yet — but Times for the Times have:
COY (shy) containing [about] C{ertain} + K{nowledge} [at first]
Make a splash with popular show the boss scores (3,3,9)
Observed at Ely perhaps, it has its ups and downs (6)
Upset a Rhode Island girl carrying goods (8)
I haven't cracked this one yet — but Times for the Times have:
A+RI (Rhode Island) + EVE (girl) containing [carrying] G+G (goods)
Daughter leaves older relative badly needing a piece of fruit (10)
I haven't cracked this one yet — but Times for the Times have:
GRAN{d}AD, (older relative) [daughter – d – leaves], ILL (badly), A. My LOI as a barely remembered the name of this fruit, better known (to me at least) as the passion fruit. Its previous appearances here were most recently in a Mephisto and a Jumbo which I would not have tackled, and prior to that in 15x15s in 2012 clued as a hidden word, and in 2009.
Endlessly examine horses kept for breeding (4)
One maintaining pianos, you say? Something fishy here (4)
My soil goes shaky? This might explain it (10)
Pass through some super meat extract (8)
Way a little sibling defines stagnation (6)
Filming part of theatre where reports may be heard (8,7)
Assume extremists for years have backed council (5)
I haven't cracked this one yet — but Times for the Times have:
DON (assume) + Y{ear}S [extremists for …] reversed [backed]
It peps up one tucking into fresh greens with hesitation (9)
Down
Characteristic spirit of English chap lacking master's degree (5)
I haven't cracked this one yet — but Times for the Times have:
E (English), THO{ma}S ( chap] [lacking master’s degree – MA]
Northern boatmen circulating completely naturally (2,3,6,4)
Disturbance at university over fellow introducing a girl (8)
I haven't cracked this one yet — but Times for the Times have:
UP (at university), HE (fellow), A, VAL (girl). ‘Over’ and ‘introducing’ simply indicate position, but perhaps a little intrusively.
Cause of discomfort, one involving head, principally (4)
I haven't cracked this one yet — but Times for the Times have:
ACE (one) containing [involving] H{ead} [principally]
Welshman takes time welcoming key priest and preacher (10)
I haven't cracked this one yet — but Times for the Times have:
EVANS (Welshman) + T (time) containing [welcoming] G (key) + ELI (priest)
Salad ingredient offered by engineer on the French railway (6)
Disputable nature of material is absorbing old university head (15)
I haven't cracked this one yet — but Times for the Times have:
CONTENT (material), then IS containing [absorbing] O (old) + U (university), then NESS (headland)
You once strayed badly, very recently (9)
Amateur poet touring India with native of Latvia (10)
I haven't cracked this one yet — but Times for the Times have:
DANTE (poet) containing [touring] I (India – NATO) + LETT (native of Latvia)
Restrict online messages — and entrance supporters? (9)
Pays to register for arduous trek (8)
Group once fashionable — a little (6)
Less confident breed of horse, do we hear? (5)
Fever absent-minded vicar initially escapes (4)
I haven't cracked this one yet — but Times for the Times have:
{v}AGUE (absent-minded) [v{icar} initially escapes]
Type letters or click words in the clue