Less attractive fruit about to be returned (6)
I believe the answer is:
uglier
'less attractive' is the definition.
(I've seen this before)
'fruit about to be returned' is the wordplay.
'fruit' becomes 'ugli' (ugli is a kind of fruit).
'about' becomes 're' (regarding).
'to be returned' shows that the letters should be reversed in order (I've seen 'is returned' mean this).
're' reversed gives 'er'.
'ugli'+'er'='UGLIER'
(Other definitions for uglier that I've seen before include "More repulsive" , "Less pleasing to look at" , "More displeasing to the sight" , "Less physically attractive" , "Less beautiful" .)