Cows maybe man’s seen on road (4)
I believe the answer is:
herd
'cows' is the definition.
(group of cows)
'man's seen on road' is the wordplay.
'man' becomes 'he' (pronoun for a man).
'seen on' is a charade indicator (letters next to each other).
'road' becomes 'rd' (abbreviation).
'he'+'rd'='HERD'
'maybe' is the link.
(Other definitions for herd that I've seen before include "A collection of livestock" , "Group of people behaving like sheep?" , "Collection of swine" , "Assemblage" , "Drive" .)