In game, small victory ends in frank exchanges (11)
I believe the answer is:
tiddlywinks
'in game' is the definition.
'tiddlywinks' can be an answer for 'game' (I've seen this before). I am not certain of the 'in' bit.
'small victory ends in frank exchanges' is the wordplay.
'small' becomes 'tiddly' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'victory' becomes 'win' (a win is a victory).
'ends in' suggests the final letters.
The final letters of 'frank exchanges' are 'ks'.
'tiddly'+'win'+'ks'='TIDDLYWINKS'
Can you help me to learn more?
(Other definitions for tiddlywinks that I've seen before include "Counter-flipping game" , "Children's game" , "Game of flicking disks" , "Game of flicking counters" , "Game of flipping counters" .)