A mule's name, possibly? (6)

I believe the answer is:

samuel

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'name possibly?' is the definition.
The definition suggests a singular noun which matches the answer.

'a mule's' is the wordplay.
'a mule's' anagrams to 'SAMUEL'.
Though, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for samuel that I've seen before include "Two books of the Bible bear this name" , "Hebrew prophet" , "OT prophet" , "-- Beckett, playwright" , "XWD SETTER" .)

I've seen this clue in the Evening Standard.

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