Staff in bar drinking drop of tequila (5)
I believe the answer is:
stave
'staff' is the definition.
('stave' can be a synonym of 'staff')
'bar drinking drop of tequila' is the wordplay.
'bar' becomes 'save' (save is a kind of bar**).
'drinking' means one lot of letters goes inside another.
'drop of' suggests taking the first letters.
The initial letter of 'tequila' is 't'.
'save' going around 't' is 'STAVE'.
'in' acts as a link.
(Other definitions for stave that I've seen before include "Bar" , "Musical staff" , "Set of lines on which musical notes are written" , "System of five horizontal lines in written music" , "Strip of wood" .)