He isn't at all odd, only indecisive (8)

I believe the answer is:

hesitant

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'indecisive' is the definition.
(synonyms)

'he isn't at all odd only' is the wordplay.
'he isn't at' anagrams to 'HESITANT'.
But, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for hesitant that I've seen before include "Demurring" , "Reluctant, vacillating" , "Lacking decisiveness" , "Uncertain, nervous" , "Pausing - undecided" .)

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