Leaders in spirit supply bottomless hip flask (7)

'leaders in spirit' is the definition.
The definition and answer can be both people as well as being plural nouns.
Maybe you can see an association between them that I don't see?

'supply bottomless hip flask' is the wordplay.
'supply' is an anagram indicator (in a supple way).
'bottomless' means to remove the last letter.
'hip' with its final letter taken off is 'hi'.
'hi'+'flask'='hiflask'
'hiflask' anagrammed gives 'KHALIFS'.

Can you help me to learn more?