Extra large import went off (6)
I believe the answer is:
addled
'off' is the definition.
(I've seen this before)
'extra large import went' is the wordplay.
I cannot really see how this works, but
'large' could be 'l' (eg in clothes sizes) and 'l' is found within the answer.
'extra' could be 'added' (something added is extra) and 'added' is found in the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for addled that I've seen before include "Befuddled" , "Gone bad (of eggs)" , "Confused, mixed up like bad egg" , "turned bad" , "Confused (wits); made rotten" .)