Crossword Genius

How waiter's keeping busy in Crime and Punishment (7,4)

Ross

I believe the answer is:

killing time

I'm a little stuck... Click here to teach me more about this clue!

'how waiter's keeping busy' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'crime and punishment' is the wordplay.
'crime' becomes 'killing' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'and' means one lot of letters go next to another.
'punishment' becomes 'time' (time in prison).
'killing'+'time'='KILLING TIME'

'in' is the link.

Can you help me to learn more?

(Other definitions for killing time that I've seen before include "Filling in spare moments" , "Occupying oneself to avoid boredom" , "Finding idle amusement - perhaps" , "Occupying oneself to pass hours" .)

I've seen this clue in The Times.
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