Crossword Genius

The piano, I note, has four legs (3)

Ross

I believe the answer is:

pig

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

'has four legs' is the definition.
I can't tell whether this defines the answer.

'the piano i note' is the wordplay.
'the piano' becomes 'p' (musical abbreviation).
'note' becomes 'g' (musical note).
'p'+'i'+'g'='PIG'

Can you help me to learn more?

(Other definitions for pig that I've seen before include "Unforged metal" , "Sow, perhaps" , "& 16 Animal pen" , "Quantity of metal" , "Empress of Blandings?" .)

I've seen this clue in the Evening Standard.
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