In hypothetical solution as well? (4)

I believe the answer is:

also

'as well?' is the definition.
(synonyms)

'in hypothetical solution' is the wordplay.
'in' indicates a hidden word.
'ALSO' is hidden within 'hypothetical solution'.

(Other definitions for also that I've seen before include "Item" , "admitted to Royal Society > too" , "Likewise" , "To boot" , "As well, in addition" .)

I've seen this clue in The Sun.

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