Hamlet's prop that could move boat on air (5)
I believe the answer is:
skull
'hamlet's prop that could move' is the definition.
I can't judge whether this defines the answer.
'boat on air' is the wordplay.
'boat' becomes 'scull' (scull is a kind of boat).
'on air' indicates a 'sounds like' (homophone) clue (how the word sounds on the radio, on air).
'scull' sounds like 'SKULL'.
Can you help me to learn more?
(Other definitions for skull that I've seen before include "Bony skeleton of the head" , "Head structure" , "The head-bone" , "Brain casing" , "Cranium" .)