Shakespeare's testament? (4)

I believe the answer is:

will

I believe this is a double definition.

'shakespeare's' is the first definition.
(I've seen this in another clue)

'testament?' is the second definition.
(synonyms)

(Other definitions for will that I've seen before include "Intention; bequeath" , "Record of final wishes and testament" , "Fixed intention" , "A traditional question from the floor?" , "Volition" .)

I've seen this clue in the Evening Standard.

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