Arresting for being tight (8)

I believe the answer is:

pinching

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

'tight' is the definition.
(thesaurus)

'arresting for being' is the wordplay.
I cannot really understand how this works, but
'being' could be 'pi' (PI is an example) and 'pi' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for pinching that I've seen before include "Stealing" , "Taking" .)

I've seen this clue in the Evening Standard.

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