Call to arms: "Hard work leads to added notoriety" (6)
I believe the answer is:
slogan
'call to arms' is the definition.
(thesaurus)
'hard work leads to added notoriety' is the wordplay.
'hard work' becomes 'slog' (I've seen this before**).
'leads to' says to take the initial letters.
The initial letters of 'added notoriety' is 'an'.
'slog'+'an'='SLOGAN'
(Other definitions for slogan that I've seen before include "Marketing phrase" , "Tag line" , "Word or phrase adopted as motto" , "Short catchy phrase used in advertising" , "Logo" .)