Pale pig devouring everything (6)
I believe the answer is:
sallow
'pale' is the definition.
(I've seen this in another clue)
'pig devouring everything' is the wordplay.
'pig' becomes 'sow' (I've seen this before).
'devouring' means one lot of letters goes inside another.
'everything' becomes 'all' (all things).
'sow' going around 'all' is 'SALLOW'.
(Other definitions for sallow that I've seen before include "Yellow-complexioned" , "Of complexion, pale or pasty" , "(Of a complexion) pale brown or yellowish" , "Of skin, yellowish in colour" , "Jaundiced" .)