Weird revolutionary claiming making mistakes leads to bold action (7-2)
I believe the answer is:
derring-do
'bold action' is the definition.
(I've seen this before)
'weird revolutionary claiming making mistakes' is the wordplay.
'weird' becomes 'odd' (I've seen this in another clue).
'revolutionary' is a reversal indicator (letters revolve around).
'claiming' means one lot of letters goes inside another.
'making mistakes' becomes 'erring' (I've seen this in another clue).
'odd' backwards is 'ddo'.
'ddo' enclosing 'erring' is 'DERRING-DO'.
'leads to' acts as a link.
(Other definitions for derring-do that I've seen before include "Literary expression for heroic courage or action" , "'bold action'" , "Courageous action" , "Brave acts" , "Swashbuckling boldness" .)