'Reposez' primarily is French for 'stand' (4)
I believe the answer is:
rest
'stand' is the definition.
(thesaurus)
'reposez primarily is french' is the wordplay.
'primarily' says to take the initial letters.
'is french' becomes 'est' (I've seen this in other clues).
The first letter of 'reposez' is 'r'.
'r'+'est'='REST'
'for' is the link.
(Other definitions for rest that I've seen before include "Surplus" , "Freedom from activity" , "Holiday" , "Pole in Crucible?" , "Stay" .)