Most of the booze overturned in the dark (5)
I believe the answer is:
night
'the dark' is the definition.
(it's dark at nighttime)
'most of the booze overturned' is the wordplay.
'most of' means to remove the last letter.
'booze' becomes 'gin' (type of alcohol).
'overturned' says the letters should be written backwards.
'the' with its last letter taken away is 'th'.
'th'+'gin'='thgin'
'thgin' written backwards gives 'NIGHT'.
'in' is the link.
(Other definitions for night that I've seen before include "Hours of darkness" , "Ignorance" , "A Hard Day's (the Beatles)" , "Time for bed" , "What proverbially follows day" .)