Quite right for salesperson to come back (6)
I believe the answer is:
proper
'quite right' is the definition.
(proper can mean done the right or correct way)
'for salesperson to come back' is the wordplay.
'for' becomes 'pro' (as in being 'pro' something).
'salesperson' becomes 'rep' (sales rep).
'to come back' says the letters should be written in reverse.
'rep' back-to-front is 'per'.
'pro'+'per'='PROPER'
(Other definitions for proper that I've seen before include "Seemly" , "Genuine; respectable" , "Appropriate according to rules" , "Correct in behaviour" , "Suitable and correct" .)