Serge's adaptation is way out (6)

I believe the answer is:

egress

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'way out' is the definition.
(thesaurus)

'serge's adaptation' is the wordplay.
'serge's' can be anagrammed to 'EGRESS'.
But, I am not clear how the anagram is indicated.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for egress that I've seen before include "Means of escape" , "Departure - exit" , "At the right moment" , "Way out, departure" , "Way to go out" .)

I've seen this clue in the Irish Times.

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