Remove lead from centre of rung? Exactly! (7)

I believe the answer is:

unplumb

'remove lead from' is the definition.
(unplumb can mean to remove lead from a coffin)

'centre of rung? exactly' is the wordplay.
'centre of' says to take the centre.
'exactly' becomes 'plumb ' (plumb can mean exactly or precisely).
The central letters of 'rung' are 'un'.
'un'+'plumb'='UNPLUMB'

I've seen this clue in The Times.

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