Crossword Genius

Correcting his typo, she forms theory (10)

Ross

I believe the answer is:

hypothesis

'theory' is the definition.
(I know that theory can be written as hypothesis)

'correcting his typo she' is the wordplay.
'correcting' is an anagram indicator (the order of letters must be corrected).
'his'+'typo'+'she'='histyposhe'
'histyposhe' is an anagram of 'HYPOTHESIS'.

'forms' is the link.

(Other definitions for hypothesis that I've seen before include "Speculation" , "Proposed explanation" , "Tentative proposition" , "idea" , "conjecture" .)

I've seen this clue in The Irish Times.
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