Salient heart of a foreigner (5)
I believe the answer is:
alien
'a foreigner' is the definition.
(synonyms)
'salient heart' is the wordplay.
'heart' says to take the centre.
The centre of 'salient' is 'ALIEN'.
'of' acts as a link.
(Other definitions for alien that I've seen before include "Otherworldly" , "exciting film based in space" , "Foreign - film directed by Ridley Scott" , "immigrant" , "of foreigners" .)