Country salesperson turned up, you heard (4)
I believe the answer is:
peru
'country' is the definition.
(Peru is an example)
'salesperson turned up you heard' is the wordplay.
'salesperson' becomes 'rep' (sales rep).
'turned up' says the letters should be written backwards.
'you heard' becomes 'U' (homophone of 'you').
'rep' back-to-front is '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" .)