Limb gets a clot round a beast in mail (9)
I believe the answer is:
armadillo
'beast in mail' is the definition.
'armadillo' can be an answer for 'beast' (armadillo is a kind of beast). I'm not sure about the 'in mail' bit.
'limb gets a clot round a' is the wordplay.
I cannot really see how this works, but
'limb' could be 'arm' (arm is a kind of limb) and 'arm' is found within the answer.
'a' is within the answer.
'round' could be 'o' (round can mean a round object) and 'o' is found in the answer.
The remaining letters 'dill' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for armadillo that I've seen before include "Scaly mammal" , "S. Am. plated mammal" , "Nocturnal animal" , "Molar laid out for the horny-plated animal" , "Burrowing mammal with a covering of bony plates" .)