Not as inert as loud (10)

I believe the answer is:

stentorian

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'loud' is the definition.
(similar in meaning)

'not as inert' is the wordplay.
'not as inert' anagrams to 'STENTORIAN'.
But, I'm not sure how the anagram is indicated.

'as' is the link.

Can you help me to learn more?

(Other definitions for stentorian that I've seen before include "booming" , "(Of a person's voice) loud and powerful" , "Strident" .)

I've seen this clue in The Irish News.

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