Couples in Paris, travelling (5)
I believe the answer is:
pairs
'couples' is the definition.
('pair' can be a synonym of 'couple')
'paris travelling' is the wordplay.
'travelling' indicates anagramming the letters.
'paris' is an anagram of 'PAIRS'.
'in' is the link.
(Other definitions for pairs that I've seen before include "Duos" , "Couples" , "golfing matches" .)