One as eligible keeps art support (5)
I believe the answer is:
easel
'art support' is the definition.
(I've seen this in another clue)
'one as eligible keeps' is the wordplay.
'keeps' indicates a hidden word.
'EASEL' can be found hidden inside 'one as eligible'.
(Other definitions for easel that I've seen before include "Display tripod" , "art supporter" , "dead-headed plant" , "Artist's wooden frame" , "stand for creativity" .)