Notice poetry being detrimental (7)
I believe the answer is:
adverse
'detrimental' is the definition.
(I've seen this before)
'notice poetry' is the wordplay.
'notice' becomes 'ad' (both can mean an advertisement).
'poetry' becomes 'verse' (synonyms).
'ad'+'verse'='ADVERSE'
'being' is the link.
(Other definitions for adverse that I've seen before include "Contrary -- inauspicious" , "In an opposing direction" , "'Unfavourable, contrary (7)'" , "Unfavourable to evaders" , "Unfavourable of the week" .)