Informs about any disheartened expressions? (7)

I believe the answer is:

sayings

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'expressions?' is the definition.
(I know this)

'informs about any disheartened' is the wordplay.
'informs' becomes 'sings' (I can't explain this - if you can you should give a lot more credence to this answer).
'about' is an insertion indicator.
'disheartened' suggests removing the centre (the middle or heart is removed).
'any' with its centre removed is 'ay'.
'sings' going around 'ay' is 'SAYINGS'.

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(Other definitions for sayings that I've seen before include "Comments" , "Maxims, adages" .)

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

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