Making one pass on licence given to small boy (6)
I believe the answer is:
lethal
'making one pass on licence' is the definition.
I can't judge whether this defines the answer.
'given to small boy' is the wordplay.
'given to' says to put letters next to each other.
'small' becomes 'let' (I can't explain this - if you can you should give a lot more credence to this answer).
'boy' becomes 'Hal'.
'let'+'hal' is 'LETHAL'.
Can you help me to learn more?
(Other definitions for lethal that I've seen before include "Capable of causing death" , "Enough to cause death" , "bringing down the curtain" , "Able to cause death" , "Noxious" .)