Fulfilment I found in working for unit (8)

I believe the answer is:

fruition

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'fulfilment' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'i found in working for unit' is the wordplay.
'found in' is an insertion indicator.
'working' is an anagram indicator.
'for'+'unit'='forunit'
'forunit' with letters rearranged gives 'frution'.
'i' going inside 'frution' is 'FRUITION'.

Can you help me to learn more?

(Another definition for fruition that I've seen is " Realisation, fulfilment".)

I've seen this clue in The Guardian and The Sun.

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