Man from Pisa accepted to an extent (5)

I believe the answer is:

isaac

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

'from pisa accepted to an extent' is the wordplay.
'to an extent' indicates the answer is hidden within the clue.
'ISAAC' is hidden within 'from pisa accepted'.

(Other definitions for isaac that I've seen before include "Father to Jacob and Esau" , "According to the book, twins' dad" , "- Newton, Eng. physicist and mathematician" , "Abraham, --, Jacob" , "one almost sacrificed" .)

I've seen this clue in The Times.

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