Exclamation coined for Buck Rogers (3)
I believe the answer is:
zap
'exclamation coined for buck rogers' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for zap that I've seen before include "Kill or shoot (in a microwave oven?)" , "Attack" , "Destroy, obliterate" , "Keep changing TV channels" , "Hit (colloq.)" .)