Stand lease being altered (5)
I believe the answer is:
easel
'stand' is the definition.
(stand for an artist's canvas)
'lease being altered' is the wordplay.
'being altered' indicates an anagram.
'lease' is an anagram of 'EASEL'.
(Other definitions for easel that I've seen before include "Constable's stand?" , "Supporter for the artist" , "Artist's stand for painting" , "Constable's supporter" , "Support in the studio" .)