Supporter of the French head of government (3)
I believe the answer is:
leg
'supporter' is the definition.
(I've seen this in another clue)
'the french head of government' is the wordplay.
'the french' becomes 'le' ('the' in French).
'head of' suggests taking the first letters.
The first letter of 'government' is 'g'.
'le'+'g'='LEG'
'of' is the link.
(Other definitions for leg that I've seen before include "part of course" , "Support; cricket side" , "Limb; stage" , "Projecting support for chair or table" , "prop" .)