Bouncing up and down to see Hope and Crosby (7)
I believe the answer is:
bobbing
'bouncing' is the definition.
The answer and definition can be both to do with motion as well as being present participle verbs.
Maybe you can see a link between them that I can't see?
'up and down to see hope and crosby' is the wordplay.
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'down' indicates named letters should be taken away (to be down something is to be missing it).
'to see hope' becomes 'bob' (comedian Bob Hope).
'crosby' becomes 'Bing' (as in singer Bing Crosby).
'and' backwards is 'dna'.
'bob'+'and'+'bing'='bobandbing'
'bobandbing' with 'dna' taken out is 'BOBBING'.
Can you help me to learn more?
(Other definitions for bobbing that I've seen before include "going up and down" , "Curtseying; cutting (hair) short" , "jumping up and down" , "taking a quick bow" .)