Support stirred game encounter (13)
I believe the answer is:
encouragement
'support' is the definition.
(I've seen this before)
'stirred game encounter' is the wordplay.
'stirred' indicates anagramming the letters.
'game'+'encounter'='gameencounter'
'gameencounter' with letters rearranged gives 'ENCOURAGEMENT'.
(Other definitions for encouragement that I've seen before include "Persuasion" , "Reassurance, cheer" , "Advocacy" , "Boost" , "Motivation" .)