A roof may be tarred (7)

I believe the answer is:

pitched

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'tarred' is the definition.
The answer and definition can be both to do with contact as well as being past participle verbs.
Perhaps you can see an association between them that I don't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for pitched that I've seen before include "Set on a particular musical note" , "Threw" , "cast" .)

I've seen this clue in The Globe and Mail.

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