The unclued lights (one hyphened) have nothing in common.

Across

4Author Henry’s daughter perhaps (not a son) making a bad slip (11)

11Hard ball scores for Scots, English not coming back (9)

12Guess sport returns after a month (5)

13Frail oracle failing doesn’t bother me (11, four words)

18Abstracts of one book colleague’s returned (7)

19One issues glove, always as a protection (7)

22In holy mountain, saint left me (6, two words)

23Firmly maintain this month has claimed lives (6)

24Surfeits of clubs and spades (5)

27Time-traveller lost in undergrowth — not urgent (5, two words)

29Cantonese boat people one featured in Japanese verse (6)

34Charm woman, endlessly keen (7)