I call out to the head gendarme in French (6)
I believe the answer is:
gallic
'french' is the definition.
(I've seen this before)
'i call out to the head gendarme' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'to' says to put letters next to each other (I've seen this in other clues).
'the head' indicates taking the first letters.
The initial letter of 'gendarme' is 'g'.
'i'+'call'='icall'
'icall' is an anagram of 'allic'.
'allic' put after 'g' is 'GALLIC'.
'in' acts as a link.
(Other definitions for gallic that I've seen before include "Pertaining to France" , "Characteristic of the French" , "Typically French or of France" , "Of the French/France" , "Like certain wars" .)