Presumptuous act put a limit on personal cover (7,3)

I believe the answer is:

liberty cap

'personal cover' is the definition.
(type of ceremonial headwear)

'presumptuous act put a limit' is the wordplay.
'presumptuous act' becomes 'liberty'.
'put' means one lot of letters go next to another.
'a limit' becomes 'cap' (I've seen this before).
'liberty'+'cap'='LIBERTY CAP'

'on' is the link.

I've seen this clue in The Independent.

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