Go the wrong way with shopping trip? (6)
I believe the answer is:
errand
'shopping trip?' is the definition.
'go the wrong way with' is the wordplay.
'go the wrong way' becomes 'err'.
'with' becomes 'and' (I've seen this before).
'err'+'and'='ERRAND'
(Other definitions for errand that I've seen before include "Message run" , "A short journey to deliver orget goods" , "Commission, message" , "Short journey done for others" , "Short assignment" .)