In a game, this call is in, just (6)
I believe the answer is:
misere
'in a game this call' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'is in just' is the wordplay.
'in' indicates putting letters inside.
'just' becomes 'mere' ('just' can mean 'mere' or 'only').
'is' put within 'mere' is 'MISERE'.
Can you help me to learn more?
(Other definitions for misere that I've seen before include "undertaking to take no tricks" , "Card-player's call" , "Taking no tricks" , "Solo whist no-tricks bid" .)