Passionate about n-nice clothes (6)
I believe the answer is:
finery
'clothes' is the definition.
(finery is a kind of clothes)
'passionate about n-nice' is the wordplay.
'passionate' becomes 'fiery' (similar in meaning).
'about' indicates putting letters inside.
'n-nice' becomes 'n' (this might be a standard abbreviation which I don't know about).
'fiery' enclosing 'n' is 'FINERY'.
Can you help me to learn more?
(Other definitions for finery that I've seen before include "smart clothes" , "Fancy clothes or trappings" , "Regalia" , "Elaborate clothing, jewellery etc" , "Showy clothing" .)