Crossword Genius

Port added to wine container subject to legal constraint (4,4)

Ross

I believe the answer is:

bind over

'subject to legal constraint' is the definition.
(to bind over is to subject to a legal demand)

'port added to wine container' is the wordplay.
'port' becomes 'dover' (I've seen this before).
'added to' says to put letters next to each other.
'wine container' becomes 'bin'.
'dover' put after 'bin' is 'BIND OVER'.

I've seen this clue in The Guardian.
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