Bets on speed of computer key (9)
I believe the answer is:
backspace
'computer key' is the definition.
'backspace' can be an answer for 'key' (I've seen this before). I'm not sure about the 'computer' bit.
'bets on speed' is the wordplay.
'bets on' becomes 'backs' (I've seen this in another clue).
'speed' becomes 'pace' (pace is a kind of speed).
'backs'+'pace'='BACKSPACE'
'of' is the link.
Can you help me to learn more?
(Another definition for backspace that I've seen is " key used to find character already in?".)