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Old Bob had to sing about this countryside feature (4)

Ross

I believe the answer is:

hill

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

This clue might be a double definition.

'old bob' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?

'to sing about this countryside feature' is the second definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'had' acts as a link.

Can you help me to learn more?

(Other definitions for hill that I've seen before include "High point, but not a mountain" , "Canvasser of opinions" , "high ground" , "Mound (of mole, ants)" , "See 14" .)

I've seen this clue in the Evening Standard.
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