Notice trade going to pot around five (6)
I believe the answer is:
advert
'notice' is the definition.
(I have seen 'Public notice ' mean 'advert' so perhaps 'notice' could also mean 'advert')
'trade going to pot around five' is the wordplay.
'going to pot' indicates an anagram.
'around' is an insertion indicator.
'five' becomes 'v' (roman numeral).
'trade' is an anagram of 'adert'.
'adert' enclosing 'v' is 'ADVERT'.
(Other definitions for advert that I've seen before include "Commercial (abbr)" , "Make reference or call attention to" , "Notice promoting goods" , "Publicity item" , "Draw attention to" .)