Disagree with senior policeman blocking agreement (10)

I believe the answer is:

contradict

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'disagree' is the definition.
(contradicting is a kind of disagreeing)

'policeman blocking agreement' is the wordplay.
'policeman' becomes 'di' (I've seen this in other clues).
'blocking' indicates putting letters inside.
'agreement' becomes 'contract' (contract is a kind of agreement).
'di' inserted inside 'contract' is 'CONTRADICT'.

'with senior' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

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(Other definitions for contradict that I've seen before include "Deny" , "Disagree" , "dispute" , "Gainsay" , "Be in conflict with" .)

I've seen this clue in The Independent.

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