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' can be anagrammed to 'HESITANT'.
But, I'm not sure how this 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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