Angry, I left in “backward and a shirker” (5)
I believe the answer is:
idler
'a shirker' is the definition.
(thesaurus)
'angry i left in backward' is the wordplay.
I cannot quite understand how this works, but
'i' is within the answer.
'left' could be 'l' (common abbreviation) and 'l' is located in the answer.
The remaining letters 'der' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'and' is the link.
Can you help me to learn more?
(Other definitions for idler that I've seen before include "Bum" , "one averse to work" , "Slacker" , "Unpowered guide pulley" , "Wastrel; The ---, Dr Johnson essays" .)