Thirteen unclued lights are of a kind (all singular, not plural) and confirmed in Chambers. 17 across gives the puzzle’s title (three words). Collins confirms 42A and the OED confirms 5D.
Across
1 What artists do wrong to extend (7, two words)
6 Sailor – another in sea is absorbed (7)
14 Maybe king rejected skill in hymn (6)
15 Clashed with officer and deserted shielded by number of Germans (8)
16 Returned reward for judge (4)
21 Advertiser tore off after concert (8)
23 Mathematician from Italy is easing off (6)
25 British engineer...

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