Blundering into strange turning, showing adventurous spirit (7-2)
I believe the answer is:
derring-do
'adventurous spirit' is the definition.
(derring-do means courage or heroism)
'blundering into strange turning' is the wordplay.
'blundering' becomes 'erring' (I've seen this in another clue).
'into' is an insertion indicator.
'strange' becomes 'odd' (I've seen this before).
'turning' is a reversal indicator.
'odd' in reverse letter order is 'ddo'.
'erring' inserted into 'ddo' is 'DERRING-DO'.
'showing' acts as a link.
(Other definitions for derring-do that I've seen before include "Daring deeds" , "Literary expression for heroic courage or action" , "Brave and heroic feat(s)" , "Swashbuckling boldness" , "Literary word for heroic courage or action" .)