Range fashionable once more (5)
I believe the answer is:
again
'once more' is the definition.
('again' can be a synonym of 'once more')
'range fashionable' is the wordplay.
'range' becomes 'aga' (I've seen this before**).
'fashionable' becomes 'in' ('in' can be similar in meaning to 'fashionable').
'aga'+'in'='AGAIN'
(Other definitions for again that I've seen before include "Furthermore" , "'Another time, once more (5)'" , "Next time" , "Moreover - a second time" , "return" .)