Crossword Genius

Mythical creature emails law firm at first (3)

Ross

I believe the answer is:

elf

I'm a little stuck... Click here to teach me more about this clue!

'mythical creature' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'emails law firm at first' is the wordplay.
'at first' says to take the initial letters.
The initial letters of 'emails law firm' is 'ELF'.

Can you help me to learn more?

(Other definitions for elf that I've seen before include "Magical being" , "Pixie (able to cobble?)" , "Mischievous fairy No.2" , "Imp-like being" , "German team?" .)

I've seen this clue in The Times.
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