Crossword Genius

Only a part of the Choral Symphony? (5)

Ross

I believe the answer is:

ninth

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

'the choral symphony?' is the definition.
(I've seen this before)

'only a part' is the wordplay.
I cannot really see how this works, but
'part' could be 'in' (synonyms) and 'in' is located in the answer.
The remaining letters 'nth' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'of' is the link.

Can you help me to learn more?

(Other definitions for ninth that I've seen before include "Beethoven's "Choral", for example" , "interval" , "Next after eight" , "Beethoven's last?" , "Third of a third" .)

I've seen this clue in the Evening Standard.
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