Sat in university's workshop. Not good enough! (14)

I believe the answer is:

unsatisfactory

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'sat in university's workshop' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives sometimes mean the same thing.

'not good enough' is the wordplay.
'not' becomes 'un' (prefix meaning 'not').
'good enough' becomes 'satisfactory' (I've seen this before).
'un'+'satisfactory'='UNSATISFACTORY'

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(Other definitions for unsatisfactory that I've seen before include "Poor" , "Not good enough" .)

I've seen this clue in the Sydney Morning Herald.

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