Everything inside we had closed off (6)

I believe the answer is:

walled

'closed off' is the definition.
(shut or walled in)

'everything inside we had' is the wordplay.
'everything' becomes 'all' (all things).
'inside' is an insertion indicator.
'we had' becomes 'we'd' (contraction of 'we had').
'all' placed inside 'wed' is 'WALLED'.

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app