Black cat makes jump suddenly (6)
I believe the answer is:
bounce
'jump suddenly' is the definition.
'bounce' can be an answer for 'jump' (bouncing is a kind of jumping). I'm unsure of the 'suddenly' bit.
'black cat' is the wordplay.
'black' becomes 'b' (as in pencil classifications).
'cat' becomes 'ounce' (ounce is a kind of cat).
'b'+'ounce'='BOUNCE'
'makes' is the link.
Can you help me to learn more?
(Other definitions for bounce that I've seen before include "Recoil like rubber ball" , "Rebound (like a cheque)" , "Spring back; resilience" , "Of a cheque, send back as worthless" , "Hop like rubber ball" .)