Across
Turkey could be so badly defeated (7)
Splitter hearing what remains of traditional fare, 18 28 (7)
I haven't cracked this one yet — but Fifteensquared have:
definition: a cleaving, a process of division or splitting homophone/"hearing" of fish 'n' from fish 'n' chips ="what remains of traditional fare", WHEN THE CHIPS ARE DOWN (i.e. missing or removed) – using the answer to 18 28
Figure second row should drop back (5)
I haven't cracked this one yet — but Fifteensquared have:
MO (moment, "second"); with TIFF=quarrel="row", dropping its back letter for a while I thought it might be FIT="row" reversed/"back", but fit=row doesn't quite work
Regulate old language across country (9)
Position taken, comment worthy of ridicule? (5,5)
I haven't cracked this one yet — but Fifteensquared have:
definition: a fielding position in cricket a 'silly point' could be a "comment worthy of ridicule"
26a
Green light totally transparent (3,5)
Rear the old Queen's dog on American dough? (12)
28a
What gets enciphered, shown unscrambled at a critical moment (4,3,5,3,4)
On stage (3)
Free bubbly came in before spread (10)
Newton-John's heartbroken about lead of Travolta in musical (2,3,4)
I haven't cracked this one yet — but Fifteensquared have:
definition: a musical by Leonard Bernstein [wiki] anagram/"broken" of ( Newton oh )*, around lead letter of T -[ravolta] the oh in the anagram fodder comes from the "heart" of J oh n
See 12
Undergarment Monet initially erased? (7)
I haven't cracked this one yet — but Fifteensquared have:
M onet with its initial erased becomes onet which can then be read as one t or a SINGLE T
See 18
Down
Deep-fried turnover, prophet tucking into it? (6)
Many university books falling to bits (6)
I haven't cracked this one yet — but Fifteensquared have:
definition as in "Look at this trove, treasures untold" U (university) + NT (New Testament, "books") + OLD="falling to bits"
So LEVEL on both sides? (5-5)
Pass horse, on climbing (5)
OK offloading one at a satisfactory distance (3,6)
I haven't cracked this one yet — but Fifteensquared have:
FA I R ENOUGH="OK", offloading the I ="one"
European rival somehow has caught up (4)
Reproduced, it's copied and made anew (8)
I haven't cracked this one yet — but Fifteensquared have:
anagram/"anew" of ( it it made)*, with it it in the anagram fodder from " it 's copied"
Indicator on ship not required (8)
Pattern emerging in rural location, having cut line in London (4,6)
Adonis little bit upset about muscly hero stealing sweetheart (9)
I haven't cracked this one yet — but Fifteensquared have:
definition: an attractive person TAD="little bit" reversed/"upset", around RAMBO="muscly hero" [wiki] , around the heart of sw-E-et
Rules drawn up on troughs for drinks (8)
Increase hydrogen, energy released from all the holes together? (8)
I haven't cracked this one yet — but Fifteensquared have:
H (chemical symbol for hydrogen), with an E (energy) removed from EIGHTE E N (all the 18 holes of a golf course)
Look over middle of arbour, somewhere shady (6)
Capital city where the novel published (6)
Spy translation of Noyes in German, not English? (5)
I haven't cracked this one yet — but Fifteensquared have:
"Noyes" is to be read as NO + YES, then translated into N E IN + JA in German, then minus E (English)
My deep hole (4)
Type letters or click words in the clue