Neat tequila is drunk initially - why, you say? (4)
I believe the answer is:
tidy
'neat' is the definition.
('tidy' can be similar in meaning to 'neat')
'tequila is drunk initially why you say?' is the wordplay.
'initially' suggests taking the first letters.
'you say?' indicates a 'sounds like' (homophone) clue.
The initial letters of 'tequila is drunk' is 'tid'.
'why' is a homophone of 'y'.
'tid'+'y'='TIDY'
(Other definitions for tidy that I've seen before include "In good order" , "Clear up" , "small container in which odds and ends are kept" , "Arranged neatly" , "Set in order" .)