Country salesperson turned up, you heard (4)
I believe the answer is:
peru
'country' is the definition.
(I know that Peru is a country)
'salesperson turned up you heard' is the wordplay.
'salesperson' becomes 'rep' (sales rep).
'turned up' shows that the letters should be reversed in order.
'you heard' becomes 'U' (homophone of 'you').
'rep' written backwards gives 'per'.
'per'+'u'='PERU'
(Other definitions for peru that I've seen before include "Mario Vargas Llosa's native land" , "Country of Lima, Cuzco and Paddington Bear" , "Mario Vargas Llosa's country" , "Homeland of Paddington Bear" , "South American country" .)