Lamps turned on small songs (6)
I believe the answer is:
psalms
'songs' is the definition.
(I have seen 'Biblical songs ' mean 'psalms' so perhaps 'songs' could also mean 'psalms')
'lamps turned on small' is the wordplay.
'turned' indicates anagramming the letters.
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'small' becomes 's' (abbreviation - e.g. clothes size).
'lamps' with letters rearranged gives 'psalm'.
'psalm'+'s'='PSALMS'
(Other definitions for psalms that I've seen before include "Religious songs" , "Devotional songs" , "Sacred songs or poems" , "Sacred songs or hymns" , "Biblical songs" .)