Neat tequila is drunk initially - why, you say? (4)
I believe the answer is:
Here is my best explanation:
'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'.