Curry favour, seeing supporter welcome wife (4)
I believe the answer is:
fawn
'curry favour' is the definition.
(both can mean to act sycophantically)
'supporter welcome wife' is the wordplay.
'supporter' becomes 'fan' (fan is a kind of supporter).
'welcome' means one lot of letters goes inside another (in sense of 'inviting in').
'wife' becomes 'w'.
'fan' enclosing 'w' is 'FAWN'.
'seeing' is the link.
(Other definitions for fawn that I've seen before include "Pale brown" , "Light grey-brown colour" , "Light brown colour" , "Young deer - beige colour" , "Sandy" .)