Crossword Genius

So is heard complaining (4)

Ross

I believe the answer is:

sick

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'complaining' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'so is heard' is the wordplay.
'so' becomes 'sic' ('sic' is 'so' in Latin).
'is heard' indicates a 'sounds like' (homophone) clue.
'sic' is a homophone of 'SICK'.

Can you help me to learn more?

(Other definitions for sick that I've seen before include "not good" , "Infirm" , "Poorly" , "well? Hardly" , "Ill; perverted" .)

I've seen this clue in the Evening Standard.
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