Unfavourable notice given to stanzas (7)
I believe the answer is:
adverse
'unfavourable' is the definition.
('adverse' can be similar in meaning to 'unfavourable')
'notice given to stanzas' is the wordplay.
'notice' becomes 'ad'.
'given to' is a charade indicator (letters next to each other).
'stanzas' becomes 'verse' (I can't explain this - if you can you should give a lot more credence to this answer).
'ad'+'verse'='ADVERSE'
Can you help me to learn more?
(Other definitions for adverse that I've seen before include "'Contrary, untoward (7)'" , "negative result" , "In an opposing direction" , "'Unfavourable, contrary (7)'" , "Unfavourable of the week" .)