Clear the nude's mostly clay (7)
I believe the answer is:
earthen
'clay' is the definition.
(I've seen this before)
'clear the nude's mostly' is the wordplay.
'mostly' indicates the answer is hidden within the clue (most of the letters in the clue).
'EARTHEN' is hidden in the letters of 'clear the nudes'.
(Other definitions for earthen that I've seen before include "of the soil" , "Made of baked clay, perhaps ware" , "that's thrown in clay" , "Made of baked or fired clay" , "Like many pots" .)