Pub situated in a part of Harrow (6)

I believe the answer is:

pinner

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

'a part of harrow' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'pub situated in' is the wordplay.
'pub' becomes 'inn' (I've seen this before).
'situated' becomes 'per' (I am not sure about this - if you are sure you should believe this answer much more).
'in' is an insertion indicator.
'inn' inserted within 'per' is 'PINNER'.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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