Calm emanating from place might spread (10)

I believe the answer is:

phlegmatic

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

'emanating from place might spread' is the wordplay.
'place might' can be anagrammed to 'PHLEGMATIC'.
Though, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for phlegmatic that I've seen before include "Unemotional" , "Unexcitable" , "Calm; philosophical" , "dull and lifeless" , "cool" .)

I've seen this clue in The Telegraph.

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