Gaiter from the past (4)
I believe the answer is:
spat
'gaiter' is the definition.
('spat' can be a synonym of 'gaiter')
'from the past' is the wordplay.
'from' indicates anagramming the letters (from the letters).
'past' with letters rearranged gives 'SPAT'.
(Other definitions for spat that I've seen before include "Minor difference" , "Trivial quarrel" , "Minor argument" , "Unimportant quarrel between Pats" , "Gestured with contempt" .)