Jack needs pub to serve spirits (4)

I believe the answer is:

jinn

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'serve spirits' is the definition.
'jinn' can be an answer for 'spirits' (jinni is a kind of spirit). I am not certain of the 'serve' bit.

'jack needs pub' is the wordplay.
'jack' becomes 'j' (playing card abbreviation).
'needs' is a charade indicator (letters next to each other).
'pub' becomes 'inn' (I've seen this before).
'j'+'inn'='JINN'

'to' is the link.

Can you help me to learn more?

(Other definitions for jinn that I've seen before include "spirits" , "spirit" .)

I've seen this clue in The Sunday Times.

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