Prize money, not the first, that batsman has (7)
I believe the answer is:
innings
'batsman has' is the definition.
Although both the answer and definition are plural nouns, I can't understand how they can define each other.
'prize money not the first' is the wordplay.
'prize money' becomes 'winnings' (money won).
'not the first' means to remove the first letter.
'winnings' with its initial letter taken off is 'INNINGS'.
'that' acts as a link.
Can you help me to learn more?
(Other definitions for innings that I've seen before include "knock" , "Period at the wicket" , "(At cricket) a turn to bat" , "Time spent batting" , "part of cricket match" .)