Supplier of eggs and mushrooms receiving a confirmation request from abroad (4-2,3)
I believe the answer is:
nest-ce pas
'confirmation request from abroad' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'supplier of eggs and mushrooms receiving a' is the wordplay.
'supplier of eggs' becomes 'nest' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'and' means one lot of letters go next to another.
'mushrooms' becomes 'ceps' (cep is a type of mushroom).
'receiving' is an insertion indicator.
'ceps' placed around 'a' is 'cepas'.
'nest'+'cepas'='NEST-CE PAS'
Can you help me to learn more?
(Other definitions for nest-ce pas that I've seen before include "Isn't it so? (French)" , "don't you think?" .)