Language from Frenchman in rear (5)
I believe the answer is:
tamil
'language' is the definition.
(Tamil is an example)
'frenchman in rear' is the wordplay.
'frenchman' becomes 'M' (abbreviation for Monsieur - like 'Mr').
'in' indicates putting letters inside.
'rear' becomes 'tail' (synonyms).
'm' put inside 'tail' is 'TAMIL'.
'from' is the link.
(Other definitions for tamil that I've seen before include "One in race" , "Member of South Indian people" , "Dravidian people of India and Sri Lanka" , "S. India/Sri Lankan person, tongue" , "South Indian people or language" .)