Very pale wash enjoyed? Not altogether! (5)
I believe the answer is:
ashen
'very pale' is the definition.
(I've seen this in another clue)
'wash enjoyed? not altogether' is the wordplay.
'not altogether' says the answer is hidden in the clue (some but not all of the letters in the clue).
'ASHEN' can be found hidden inside 'wash enjoyed'.
(Other definitions for ashen that I've seen before include "Grey-faced" , "of Tree" , "Wan, pale" , "pale in colour" , "'Very pale, from shock say (5)'" .)