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9Ac [Are you wearing a tie? So dine perhaps] (1,2,5).

I can see the answer is a la carte from the crossers and definition but can anyone help with the parsing please?

are you - art
A tie - a lace a lac art e
?

Thanks!

Could someone please parse 7 down, Spin and its advantage (6). It looks like profit but I can't see why.
Also 22 across, Scientific units on official business (4). I think it must be ohms but again I don't get it.

22a On Her Majesty's Service / scientific units

22 On Her Majesty's Service, OHMS, used to be franked on official mail.

Thanks cerasus and chips.
I see 7dn has been parsed on another thread.