Moderate to low voice's turn to be bathed in light (8)
I believe the answer is:
passable
'moderate' is the definition.
(thesaurus)
'low voice's turn to be bathed in light' is the wordplay.
'low voice' becomes 'bass' (I've seen this before).
'turn' says the letters should be written backwards.
'to be bathed in' indicates putting letters inside (I've seen this in other clues).
'light' becomes 'pale' (light in colour).
'bass' backwards is 'ssab'.
'ssab' going within 'pale' is 'PASSABLE'.
'to' is the link.
(Other definitions for passable that I've seen before include "Fairly good but not outstanding" , "OK" , "okay?" , "not hogging the road" , "All right" .)