Snooker ball on playing surface in complete dark (5-5)
I believe the answer is:
pitch-black
'in complete dark' is the definition.
(pitch-black means very dark)
'snooker ball on playing surface' is the wordplay.
'snooker ball' becomes 'black' (snooker includes a black ball).
'on' is a charade indicator (letters next to each other).
'playing surface' becomes 'pitch' (eg a football pitch).
'black' after 'pitch' is 'PITCH-BLACK'.
(Other definitions for pitch-black that I've seen before include "Dreadfully dark" , "Completely dark" .)