One speculates about its other forms (8)

I believe the answer is:

theorist

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'one speculates' is the definition.
I can't judge whether this defines the answer.

'its other forms' is the wordplay.
'forms' indicates anagramming the letters.
'its'+'other'='itsother'
'itsother' anagrammed gives 'THEORIST'.

'about' acts as a link.

Can you help me to learn more?

(Other definitions for theorist that I've seen before include "An expert in abstract principles" , "Abstract reasoner" , "Speculator" , "Expert in established hypotheses" , "Creator of hypothesis" .)

I've seen this clue in The Globe and Mail.

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