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Bash shin up, or knee-cap? (6)

Ross

I believe the answer is:

punish

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'knee-cap?' is the definition.
Although both the answer and definition are verbs in their base form, I don't understand how they can define each other.

'bash shin up' is the wordplay.
'bash' indicates anagramming the letters.
'shin'+'up'='shinup'
'shinup' is an anagram of 'PUNISH'.

'or' is the link.

Can you help me to learn more?

(Other definitions for punish that I've seen before include "Inflict a penalty upon" , "Treat harshly or severely" , "Cause to suffer for an offence" , "Impose penalty for crime or misbehaviour" , "exact retribution" .)

I've seen this clue in the Sydney Morning Herald.
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