Crossword Genius

Something that defends bit of Suffolk, Lincoln or Herdwick? (7)

Ross

I believe the answer is:

rampart

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

'herdwick?' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see an association between them that I don't see?

'something that defends bit of suffolk lincoln' is the wordplay.
I cannot really understand how this works, but
'bit' could be 'part' (I've seen this before) and 'part' is found within the answer.
The remaining letters 'ram' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'or' is the link.

Can you help me to learn more?

(Other definitions for rampart that I've seen before include "Fortified wall" , "Defensive structure" , "section of defence?" , "Defensive wall or mound" , "Broad defensive wall" .)

I've seen this clue in The Guardian.
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