Extremely stylish suit (2,6)
I believe the answer is:
in spades
'extremely' is the definition.
(I've seen this before)
'stylish suit' is the wordplay.
'stylish' becomes 'in'.
'suit' becomes 'spades' (playing card suit).
'in'+'spades'='IN SPADES'
(Other definitions for in spades that I've seen before include "Seriously" , "to a large degree" , "To a very great degree" , "Without restraint" , "Emphatically" .)