Knowing about insect resin, some police enter softly (9)

I believe the answer is:

flaccidly

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'softly' is the definition.
Both the answer and definition are adverbs.
Perhaps you can see a link between them that I can't see?

'knowing about insect resin some police enter' is the wordplay.
'knowing' becomes 'fly'.
'about' is an insertion indicator.
'insect resin' becomes 'lac' (I've seen this in another clue).
'some police' becomes 'CID' (abbreviation for Criminal Investigation Department).
'enter' is an insertion indicator.
'fly' going around 'lac' is 'flacly'.
'flacly' placed around 'cid' is 'FLACCIDLY'.

Can you help me to learn more?

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

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