Free bar — I'm full to capacity (5)

I believe the answer is:

abrim

'full to capacity' is the definition.

'free bar i'm' is the wordplay.
'free' indicates anagramming the letters.
'i'm' becomes 'im' (**).
'bar' anagrammed gives 'abr'.
'abr'+'im'='ABRIM'

(Other definitions for abrim that I've seen before include "Spilling over" , "Completely full" .)

I've seen this clue in The Guardian.

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