Shut this way (4)

I believe the answer is:

thus

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'this way' is the definition.
(thesaurus)

'shut' is the wordplay.
'shut' anagrams to 'THUS'.
But, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for thus that I've seen before include "In this way" , "'So, therefore (4)'" , "Consequently" , "Therefore, hence" , "It follows" .)

I've seen this clue in The Irish Independent.

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