Really hot day unsettles her crocs (8)

I believe the answer is:

scorcher

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'really hot day' is the definition.
(I've seen this in another clue)

'unsettles her crocs' is the wordplay.
'her crocs' anagrams to 'SCORCHER'.
But, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for scorcher that I've seen before include "sweltering day" , "something remarkable" , "Brand, perhaps" , "Day of very hot and sunny weather" , "A boiling hot day" .)

I've seen this clue in the Sydney Morning Herald.

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