The beast would seem to claim to be ten (4)
I believe the answer is:
ibex
'the beast' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'would seem to claim to be ten' is the wordplay.
I cannot really understand how this works, but
'be' is found in the answer.
'ten' could be 'x' (Roman numeral) and 'x' is found in the answer.
A single letter 'i' remains 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 ibex that I've seen before include "Wild goat with double curved horns" , "Mountain goat with long curved horns" , "Come out of an egg" , "Wild mountain goat" , "Large-horned wild goat" .)