A vital point when it comes to a purchase (7) ???c???
Preposition used in any amount of sentences (4) ??t?
What it means to a barman (7) ???l???
One of the kingdoms of earth (6) a?????
The clue should really read: What "it" means to a barman.
If you ask a barman/bartender for a Gin and It, you will get a gin with some Italian vermouth in it. That's what "it" means to a barman/bartender.