Manage rugby session finally (3)
I believe the answer is:
run
'manage' is the definition.
(both can mean to organise)
'rugby session finally' is the wordplay.
'rugby' becomes 'RU'.
'finally' indicates one should take the final letters.
The final letter of 'session' is 'n'.
'ru'+'n'='RUN'
(Other definitions for run that I've seen before include "Flow; smuggle (goods)" , "Control" , "Compete in race or election" , "Ladder - manage - sprint - flow" , "Could be an extra" .)