Crossword Genius

Make a mistake with mission (6)

Ross

I believe the answer is:

errand

'mission' is the definition.
(I've seen this before)

'make a mistake with' is the wordplay.
'make a mistake' becomes 'err' (to err is to make an error).
'with' becomes 'and'.
'err'+'and'='ERRAND'

(Other definitions for errand that I've seen before include "Commission, message" , "Messenger's job" , "Job usually involving a short trip" , "Journey to deliver message etc" , "Useful journey" .)

I've seen this clue in The Telegraph and The Times.
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