Perhaps arm cracking whip in some French dairy (9)
I believe the answer is:
camembert
'some french dairy' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'perhaps arm cracking whip' is the wordplay.
'perhaps arm' becomes 'member' (I can't explain this - if you can you should give a lot more credence to this answer).
'cracking' means one lot of letters goes inside another (inserted letters go into a gap or crack).
'whip' becomes 'cat' (cat o' nine tails, cat for short is a type of whip).
'member' going within 'cat' is 'CAMEMBERT'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for camembert that I've seen before include "Rich soft French cheese" , "Soft rich cheese as made in Normandy" , "For something to eat" , "soft fare" , "French produce" .)