Release a part? That's not generous (10)

I believe the answer is:

unhandsome

'not generous' is the definition.
(I've seen this before)

'release a part?' is the wordplay.
'release' becomes 'unhand' (unhanding is a kind of releasing**).
'a part?' becomes 'some' (I've seen this before).
'unhand'+'some'='UNHANDSOME'

'that's' is the link.

(Another definition for unhandsome that I've seen is " Not generous".)

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