Hardly prudent (4)
I believe the answer is:
rash
'hardly prudent' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rash that I've seen before include "Red area on skin" , "sign of irritation?" , "Headstrong" , "Ill-considered - break-out" , "Outbreak; hasty" .)