Dance interrupted by copper throwing back liqueur (7)
I believe the answer is:
sambuca
'liqueur' is the definition.
(I have seen 'Italian liqueur ' mean 'sambuca' so perhaps 'liqueur' could also mean 'sambuca')
'dance interrupted by copper throwing back' is the wordplay.
'dance' becomes 'samba' (Brazilian dance).
'interrupted by' indicates putting letters inside.
'copper' becomes 'Cu' (Cu is the chemical symbol for copper).
'throwing back' is a reversal indicator.
'cu' written backwards gives 'uc'.
'samba' placed around 'uc' is 'SAMBUCA'.
(Other definitions for sambuca that I've seen before include "strong drink" , "Aniseed liqueur" , "Italian liqueur flavoured with liquorice" , "Liquorice-flavoured liqueur" , "Maybe a shot" .)