Crossword Genius

Musical name for the letter F (7)

Ross

I believe the answer is:

foxtrot

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

'musical name' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'the letter f' is the wordplay.
I cannot really understand how this works, but
'letter' could be 'x' and 'x' is found in the answer.
'f' is found in the answer.
This explanation may well be incorrect...

'for' acts as a link.

Can you help me to learn more?

(Other definitions for foxtrot that I've seen before include "Lively ballroom dance" , "Ballroom dance in quadruple time" .)

I've seen this clue in the Evening Standard.
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