Argue hint could be more suggestive (9)
I believe the answer is:
naughtier
'more suggestive' is the definition.
(naughty can mean sexually suggestive)
'argue hint could be' is the wordplay.
'could be' indicates anagramming the letters.
'argue'+'hint'='arguehint'
'arguehint' is an anagram of 'NAUGHTIER'.
(Other definitions for naughtier that I've seen before include "more unruly" , "More badly behaved" , "Less well behaved" , "Worse" , "More mischievous" .)