Huge groans heard by public (7)
I believe the answer is:
outsize
'huge' is the definition.
(thesaurus)
'heard by public' is the wordplay.
'heard' becomes 'size' (I can't explain this - if you can you should give a lot more credence to this answer).
'by' is a charade indicator (letters next to each other).
'public' becomes 'out' (out can mean released to the public).
'size' after 'out' is 'OUTSIZE'.
'groans' is the link.
This may not be correct. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for outsize that I've seen before include "Much larger than average, say clothes" , "Massive" , "Extra-large (garment)" , "Extra large (clothes)" , "Overlarge" .)