Make fun of Frenchman opening part of race naked? (7)
I believe the answer is:
lampoon
'make fun of' is the definition.
(lampooning is a kind of making fun of)
'frenchman opening part of race naked?' is the wordplay.
'frenchman' becomes 'm' (abbreviation for Monsieur - like 'Mr').
'opening' means one lot of letters goes inside another (some letters open a gap in others).
'part of race' becomes 'lap' (I've seen this in other clues).
'naked?' becomes 'oon' (I can't justify this - if you can you should give a lot more credence to this answer).
'm' inserted within 'lap' is 'lamp'.
'lamp'+'oon'='LAMPOON'
(Other definitions for lampoon that I've seen before include "Satirical personal attack" , "Pool man (anag)" , "Parody" , "Satirical work" , "Ridicule with satire" .)