Make a mistake and run for it (6)
I believe the answer is:
errand
'run for it' is the definition.
I can't judge whether this defines the answer.
'make a mistake and' is the wordplay.
'make a mistake' becomes 'err' (to err is to make an error).
'err'+'and'='ERRAND'
Can you help me to learn more?
(Other definitions for errand that I've seen before include "A little job" , "A short journey to deliver orget goods" , "Useful journey" , "short shopping trip" , "purposeful journey" .)