Crossword Genius

Part of the railroad I’d sing about (6)

Ross

I believe the answer is:

siding

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

'part of the railroad' is the definition.
'siding' can be an answer for 'railroad' (thesaurus). I am unsure of the 'part of the' bit.

'i'd sing about' is the wordplay.
'about' means one lot of letters goes inside another.
'id' inserted inside 'sing' is 'SIDING'.

Can you help me to learn more?

(Other definitions for siding that I've seen before include "Railway spur" , "Stretch of railway used to store trains" , "passing track" , "Railway marshalling area" , "Where coaches may be" .)

I've seen this clue in the Evening Standard.
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