Across
Paddy in sensible jumper at first gets a degree of comfort (4,11)
I haven't cracked this one yet — but Fifteensquared have:
in the definition, "degree" can refer to a unit of temperature (e.g. degrees Celsius) TEMPER="Paddy" (a fit of anger/temper), inside MATURE="sensible"; with ROO (kangaroo, jumping animal, "jumper") going first
Make a break-through and exploit an opportunity (6,2,7)
Online extra involving ten mathematical characters (5,10)
I haven't cracked this one yet — but Fifteensquared have:
anagram/["involving" the "characters"/letters] of (ten mathematical)*
Attire for the Lido with roughly two GCSEs, minimum (8,7)
Drunk professional taking note at popular conference for body-building regime (4-7,4)
Former girl-friend with soldier taking steps in Spanish art form (8,7)
WW1 vessel made from scale bus remains (1,5,9)
I haven't cracked this one yet — but Fifteensquared have:
definition: a British submarine used in WW1 anagram of/"made from": (scale bus remains)*
Dined out with Applecross refugee (9,6)
I haven't cracked this one yet — but Fifteensquared have:
anagram/"out" of (Dined Applecross)*
Down
Former BBC newsreader who is Jeremy Vine’s wife disturbed old Cheshire calf (6,9)
I haven't cracked this one yet — but Fifteensquared have:
anagram/"disturbed" of (old Cheshire calf)*
Surgical surfaces somehow obliterate pangs (9,6)
I haven't cracked this one yet — but Fifteensquared have:
anagram/"somehow" of (obliterate pangs)*
Complete ruin of tenor and alto transcription (5)
I haven't cracked this one yet — but Fifteensquared have:
to TOTAL is to damage something beyond repair, to complete its ruin / to completely ruin it T (for Tenor) plus anagram/"transcription" of (alto)*
Originally massive old avian NZ resident once (3)
I haven't cracked this one yet — but Fifteensquared have:
definition: extinct large birds from New Zealand first letters (Originally) of M-[assive] O-[ld] A-[vian]
A wander up to historic Portuguese city (5)
I haven't cracked this one yet — but Fifteensquared have:
definition: a Portuguese city that is a World Heritage Site with many historical buildings and monuments A ROVE="A wander", reversed/"up"
It’s a winner during matches regularly (3)
I haven't cracked this one yet — but Fifteensquared have:
definition: an ACE is a winning serve in a tennis match ACE appears "regularly" as alternate letters from [m]-A-[t]-C-[h]-E-[s]
Club name on pick-up trucks for water board in northern England (6,9)
Conclusion – of course! (10,5)
Brown and green phonetic letter (5)
Takes in poor Shona wears (3,2)
I haven't cracked this one yet — but Fifteensquared have:
anagram/"poor" of (Shona)*
Tree that’s found on satnav on borders of Lancashire (5)
I haven't cracked this one yet — but Fifteensquared have:
MAP="that's found on satnav"; plus outer letters/"borders" of L-[ancashir]-E
Belief for which a Native American died (5)
Function at company – just a very short time (5)
Inhuman geek regularly at The Cloud over the channel (5)
I haven't cracked this one yet — but Fifteensquared have:
definition: French [as spoken 'over the Channel'] for 'cloud' regular letters taken from [i]-N-[h]-U-[m]-A-[n] G-[e]-E-[k]
The sun should even things out (3)
I haven't cracked this one yet — but Fifteensquared have:
the letters from S-[h]-O-[u]-L-[d], with the "even" letters taken "out"
Hospital space available in the garden (3)
Type letters or click words in the clue