Crossword Genius

Unmissable tops of mountains and tors surrounding American diocese (4-3)

Ross

I believe the answer is:

must-see

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'unmissable' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for must-see that I've seen before include "Unmissable" , "Remarkable sight" .)

I've seen this clue in The Independent.
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