Rare set notched like a saw (7)

I believe the answer is:

serrate

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'notched like a saw' is the definition.
(I've seen this in another clue)

'rare set' is the wordplay.
'rare set' can be anagrammed to 'SERRATE'.
Though, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for serrate that I've seen before include "Jag" , "Make a saw-toothed edge" , "To notch" .)

I've seen this clue in The Irish News.

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