Crossword Genius

Resignation letter penned by one avoiding funny business (14)

Ross

I believe the answer is:

submissiveness

I'm a little stuck... Click here to teach me more about this clue!

'resignation' is the definition.
(thesaurus)

'letter penned by one avoiding funny business' is the wordplay.
I cannot quite see how this works, but
'letter' could be 'missive' (synonyms) and 'missive' is found in the answer.
This explanation may well be incorrect...

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I've seen this clue in The Hindu.
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