King further imprisoning old sculptor (5,5)

I believe the answer is:

henry moore

'sculptor' is the definition.
(I've seen this before)

'king further imprisoning old' is the wordplay.
'king' becomes 'henry' (I've seen this before).
'further' becomes 'more' (synonyms).
'imprisoning' is an insertion indicator.
'old' becomes 'o' (abbreviation as in OT - Old Testament).
'more' enclosing 'o' is 'moore'.
'henry'+'moore'='HENRY MOORE'

(Another definition for henry moore that I've seen is " Sculptor".)

I've seen this clue in The Everyman puzzle in The Observer.

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