Backed some debate that is key on computer (3)
I believe the answer is:
tab
'key on computer' is the definition.
'tab' can be an answer for 'key' (key on a computer keyboard). I'm unsure of the 'on computer' bit.
'backed some debate that' is the wordplay.
'backed' says the letters should be written in reverse.
'some' says the answer is hidden in the clue (some parts of the word are used).
'bat' is hidden in the letters of 'debate that'.
'bat' written backwards gives 'TAB'.
'is' is the link.
Can you help me to learn more?
(Other definitions for tab that I've seen before include "Ring pull" , "ticket" , "Small flap - bill" , "Tag" , "Till bill" .)