1a) Catholic mass - birth represented with bovine gift (9,3)
2d) Office holder's regret about books' new brand (6,4)
7d) Minor errors in so-called epic novel (12)
10d) Submit joint foreign articles (7,5)
11a) Barrel-maker facing a setback is willing to help (10)
Apology for no letters. All help much appreciated
christmas box (anag, c mass birth +ox)
rubber band (anag. rue bb brand)
peccadilloes (anag. so called epic)
knuckle under
cooperates (anag. cooper + 'a set' backwards)