Reserve empty table with a drink (3,3)
I believe the answer is:
ice tea
'drink' is the definition.
(ice tea is a kind of drink)
'reserve empty table with a' is the wordplay.
'reserve' becomes 'ice' (I've seen this before).
'empty' suggests removing the centre.
'with' says to put letters next to each other.
'table' with its centre taken out is 'te'.
'ice'+'te'+'a'='ICE TEA'
(Other definitions for ice tea that I've seen before include "Chilled drink flavoured with lemon" , "refreshing drink" , "Cold summer drink" , "refresher" , "Cool non-alcoholic drink" .)