Clean beneath exhibits (4)
I believe the answer is:
neat
'clean' is the definition.
(I know that clean can be written as neat)
'beneath exhibits' is the wordplay.
'exhibits' indicates a hidden word.
'NEAT' can be found hidden inside 'beneath'.
(Other definitions for neat that I've seen before include "farm animals" , "Tidy - cool!" , "Nicely proportioned" , "Imaginative" , "Clean and orderly" .)