Reserve to give penalty during a game (4)
I believe the answer is:
book
'reserve' is the definition.
(to book something is to reserve it)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for book that I've seen before include "strict regulations" , "Volume - maybe thrown at offender" , "thing that shouldn't be cooked?" , "See 1 ac" , "Reserve; tome" .)