Crossword Genius

Something sustaining, perhaps, for the pianist (5)

Ross

I believe the answer is:

pedal

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

'pianist' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for pedal that I've seen before include "Lever worked by foot" , "Plead for bike pusher" , "related to feet" , "Brake or clutch perhaps" , "One may be sustaining" .)

I've seen this clue in the Evening Standard.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.