Finally do buy everyone drinks and case for tobacco (3,6,2)

'finally do buy' is the definition.
I can't judge whether this defines the answer.

'everyone drinks and case for tobacco' is the wordplay.
'everyone' becomes 'geta' (I can't justify this - if you can you should believe this answer much more).
'drinks' becomes 'round' (as in a round of drinks).
'and' means one lot of letters go next to another.
'case for' suggests removing the centre (the letters which encase the others are used).
'tobacco' with its middle removed is 'to'.
'geta'+'round'+'to'='GET AROUND TO'

Can you help me to learn more?