Odd problem about straying into heroism (9)
I believe the answer is:
derringdo
'heroism' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'odd problem about straying' is the wordplay.
'problem' is an anagram indicator.
'about' is an insertion indicator.
'straying' becomes 'erring' ('err' can be a synonym of 'stray').
'odd' anagrammed gives 'ddo'.
'ddo' placed around 'erring' is 'DERRINGDO'.
'into' is the link.
Can you help me to learn more?
(Another definition for derringdo that I've seen is " heroic action".)