Underworld boss's tailless old plane maybe given to tycoon (9)
I believe the answer is:
plutocrat
'given to tycoon' is the definition.
I can't judge whether this defines the answer.
'underworld boss's tailless old plane' is the wordplay.
'underworld boss' becomes 'pluto' (Roman god of the underworld).
'tailless' means to remove the last letter (the tail of the word is removed).
'old plane' becomes 'crate' (informal term for an old vehicle).
'crate' with its final letter removed is 'crat'.
'pluto'+'crat'='PLUTOCRAT'
'maybe' is the link.
Can you help me to learn more?
(Other definitions for plutocrat that I've seen before include "Capitalist" , "one wealthy" , "One could bankroll the movie?" , "Powerful rich man" , "One powerful through wealth" .)