Walk out, perhaps, then run forward (7)
I believe the answer is:
striker
'forward' is the definition.
(I've seen this before)
'walk out perhaps then run' is the wordplay.
'walk out perhaps' becomes 'strike'.
'then' is a charade indicator (letters next to each other).
'run' becomes 'r' (cricket abbreviation).
'strike'+'r'='STRIKER'
(Other definitions for striker that I've seen before include "Batsman facing the bowling" , "Football attacker" , "player likely to score goal" , "Football player" , "Cricketer facing the bowlers" .)