Fixation with France and French — want to be guillotined! (6)
I believe the answer is:
fetish
'fixation' is the definition.
(thesaurus)
'france and french want to be guillotined' is the wordplay.
'france' becomes 'f'.
'and french' becomes 'et' ('and' in the French language).
'want' becomes 'wish' (wishing is a kind of wanting).
'to be guillotined' means to remove the first letter.
'wish' with its first letter taken away is 'ish'.
'f'+'et'+'ish'='FETISH'
'with' is the link.
(Other definitions for fetish that I've seen before include "An abnormal object of sexual desire" , "thing?" , "Object worshipped by primitive people or of abnormal sexual interest" , "charm" , "Object of unreasoning devotion" .)