Missile-launcher that gets the pulse going (10)
I believe the answer is:
peashooter
'missile-launcher that gets the' is the definition.
I can't tell whether this defines the answer.
'pulse going' is the wordplay.
'pulse' becomes 'pea' (I've seen this before).
'going' becomes 'shooter' (I can't explain this - if you can you should give a lot more credence to this answer).
'pea'+'shooter'='PEASHOOTER'
Can you help me to learn more?
(Other definitions for peashooter that I've seen before include "child's toy" , "Primitive weapon" , "Child's "gun"" , "Toy weapon" .)