Rotter ordered out of date goods (3,3)
I believe the answer is:
bad egg
'rotter' is the definition.
(I've seen this before)
'ordered out of date goods' is the wordplay.
I cannot really understand how this works, but
'ordered' could be 'bade' (past tense of 'bid' as in to order) and 'bade' is present in the answer.
'goods' could be 'gg' (an abbreviation for 'good' repeated) and 'gg' is found in the answer.
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 bad egg that I've seen before include "Nasty person like addled ovoid" , "Worthless individual" , "Villain" , "Nasty fellow like addled ovum" , "Was the cartoon curate presented with one" .)