Little game turned on (6)
I believe the answer is:
meagre
'little' is the definition.
(I've seen this before)
'game turned on' is the wordplay.
'turned' indicates anagramming the letters.
'on' becomes 're' ('on' can be mean 'with reference to').
'game' is an anagram of 'meag'.
'meag'+'re'='MEAGRE'
(Other definitions for meagre that I've seen before include "miserly" , "Scarce, not plentiful" , "Scanty, not plentiful" , "little" , "weak" .)