They're heard to make a terrible stink about a bit of trouble! (7)

I believe the answer is:

tinkles

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'they're heard to' is the definition.
The definition suggests an adverb but the answer is not.

'a terrible stink about a bit of trouble' is the wordplay.
'a terrible' indicates anagramming the letters.
'about' is an insertion indicator.
'a bit of trouble' becomes 'le' (I can't explain this - if you can you should believe this answer much more).
'stink' with letters rearranged gives 'tinks'.
'tinks' enclosing 'le' is 'TINKLES'.

'make' acts as a link.

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(Another definition for tinkles that I've seen is " Rings (a little bell)".)

I've seen this clue in the Evening Standard.

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