Nag French and criticise luggage (9)
I believe the answer is:
carpetbag
'luggage' is the definition.
(carpetbag is a kind of luggage)
'nag french and criticise' is the wordplay.
'nag' becomes 'carp' (I've seen this in another clue).
'french and' becomes 'et' ('and' in the French language).
'criticise' becomes 'bag' (I can't explain this - if you can you should give a lot more credence to this answer).
'carp'+'et'+'bag'='CARPETBAG'
Can you help me to learn more?
(Other definitions for carpetbag that I've seen before include "Piece of luggage" , "Presumptuously seek success in a new locality - eg tap crab (anag)" .)