Unfashionable group from the word go (6)
I believe the answer is:
outset
'the word go' is the definition.
('from the word go' means from the beginning)
'unfashionable group' is the wordplay.
'unfashionable' becomes 'out' ('out' can be a synonym of 'unfashionable').
'group' becomes 'set' (set is a kind of group**).
'out'+'set'='OUTSET'
'from' acts as a link.
(Other definitions for outset that I've seen before include "Inception" , "Set out in the beginning" , "Beginning, start" , "Starting point" , "launch" .)