Movement of football player? Ref rants if it's foul (8)
I believe the answer is:
transfer
'movement of football player?' is the definition.
(transfer from one football club to another)
'ref rants if it's foul' is the wordplay.
'if it's foul' indicates anagramming the letters (an incorrect or foul arrangement of the letters).
'ref'+'rants'='refrants'
'refrants' with letters rearranged gives 'TRANSFER'.
(Other definitions for transfer that I've seen before include "Move, change (to new place)" , "Change (from one thing to another)" , "Move to another side or team" , "Reassign" , "Star fern (anag.)" .)