Foolhardiness (8)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
temerity
'foolhardiness' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for temerity that I've seen before include "Impudence" , "Overconfidence" , "Excessive boldness" , "Gall" , "Presumption" .)