Lie about going to clubs perhaps in smart gear (6,4)
I believe the answer is:
lounge suit
'smart gear' is the definition.
(smart outfits)
'lie about going to clubs perhaps' is the wordplay.
'lie about' becomes 'lounge' (to lounge is to lie or laze around).
'going to' means one lot of letters go next to another.
'clubs perhaps' becomes 'suit' (clubs is a playing card suit).
'lounge'+'suit'='LOUNGE-SUIT'
'in' acts as a link.
(Other definitions for lounge suit that I've seen before include "Attire" , "Smart clothing" , "Common habit of man" , "Smart day wear for men" , "what smart fellow assumes" .)