Feline admirer not at ease in this? (6)
I believe the answer is:
clover
'ease in this?' is the definition.
('in clover' means 'in luxury and ease')
'feline admirer not at' is the wordplay.
'feline' becomes 'cat' (I've seen this before).
'admirer' becomes 'lover' (I've seen this before).
'not' is a deletion indicator.
'cat'+'lover'='catlover'
'catlover' with 'at' taken out is 'CLOVER'.
(Other definitions for clover that I've seen before include "A four-leafed one is lucky" , "Three-leaved wild plant" , "Green trefoil plant" , "A four-leaved one is considered lucky" , "Plant used as fodder (which it's good to be in)" .)