Credit a politician with something restrictive (5)

I believe the answer is:

cramp

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'something restrictive' is the definition.
I can't judge whether this defines the answer.

'credit a politician' is the wordplay.
'credit' becomes 'cr' (abbreviation).
'politician' becomes 'MP' (Member of Parliament).
'cr'+'a'+'mp'='CRAMP'

'with' is the link.

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(Other definitions for cramp that I've seen before include "Give too little space to" , "Involuntary muscular contraction" , "restraint" , "To restrict; a muscle pain" , "Muscular spasm, very painful" .)

I've seen this clue in the Evening Standard.

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