Knock profits leader wasted (7)
I believe the answer is:
innings
'knock' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for innings that I've seen before include "Batsman's spell at wicket" , "period in office" , "Period of batting in cricket" , "A team's turn at batting" , "part of cricket match" .)