Arrest fan finally home after game (3,2)
I believe the answer is:
run in
'arrest' is the definition.
(thesaurus)
'fan finally home after game' is the wordplay.
'finally' indicates one should take the final letters.
'home' becomes 'in' ('he's home' can mean 'he's in').
'after' is a charade indicator (letters next to each other).
'game' becomes 'ru' (rugby union).
The final letter of 'fan' is 'n'.
'n'+'in'='nin'
'nin' put after 'ru' is 'RUN-IN'.
(Other definitions for run in that I've seen before include "Altercation" , "Disagreement (with authority?)" , "Quarrel; set-to" , "Informally, take into custody - on the trot?" , "Dust-up, row" .)