Make a mess of power grab acquiring fashion brand (4,2)

I believe the answer is:

cock up

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'make a mess' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'power grab acquiring fashion brand' is the wordplay.
'power grab' becomes 'coup' (I've seen this in another clue).
'acquiring' is an insertion indicator.
'fashion brand' becomes 'CK' (Calvin Klein).
'coup' enclosing 'ck' is 'COCK-UP'.

'of' is the link.

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