Time to get reckless? Nonsense (5)
I believe the answer is:
trash
'nonsense' is the definition.
(I know that nonsense can be written as trash)
'time to get reckless?' is the wordplay.
'time' becomes 't' (abbreviation).
'to get' means one lot of letters go next to another.
'reckless?' becomes 'rash' ('rash' can be a synonym of 'reckless').
't'+'rash'='TRASH'
(Other definitions for trash that I've seen before include "bull" , "Anything of poor quality" , "American refuse" , "Rubbish, waste" , "Rubbish - destroy" .)