Just right for salesman retiring (6)
I believe the answer is:
proper
'just right' is the definition.
(thesaurus)
'for salesman retiring' is the wordplay.
'for' becomes 'pro' (I've seen this before).
'salesman' becomes 'rep' (I've seen this before).
'retiring' shows that the letters should be reversed in order.
'rep' reversed gives 'per'.
'pro'+'per'='PROPER'
(Other definitions for proper that I've seen before include "Correct; formal" , "Conventional" , "Conforming to etiquette" , "Authentic" , "well-behaved" .)