Session gains once wife joins (7)
I believe the answer is:
innings
This might be a double definition.
'session' is the first definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'once wife joins' is the second definition.
Although both the answer and definition are plural nouns, I don't understand how one could define the other.
'gains' is the link.
Can you help me to learn more?
(Other definitions for innings that I've seen before include "period in office" , "Time spent batting" , "(At cricket) a turn to bat" , "knock" , "Turns for the batsman" .)