Unfavourable notice with few lines (7)
I believe the answer is:
adverse
'unfavourable' is the definition.
('adverse' can be similar in meaning to 'unfavourable')
'notice with few lines' is the wordplay.
'notice' becomes 'ad'.
'with' says to put letters next to each other.
'few lines' becomes 'verse'.
'ad'+'verse'='ADVERSE'
(Other definitions for adverse that I've seen before include "In an opposing direction" , "Opposed to or unfavourable" , "Dire" , "'Unfavourable, contrary (7)'" , "Contrary -- inauspicious" .)