Excessive period to get up after a minute liqueur (8)
I believe the answer is:
amaretto
'liqueur' is the definition.
(I've seen this before)
'excessive period to get up after a minute' is the wordplay.
'excessive' becomes 'ott' (short for 'over the top' - informal British).
'period' becomes 'era' (era is a kind of period**).
'to get up' says the letters should be written backwards.
'after' says to put letters next to each other.
'minute' becomes 'm' (abbreviation).
'ott'+'era'='ottera'
'ottera' in reverse letter order is 'aretto'.
'a'+'m'='am'
'aretto' put after 'am' is 'AMARETTO'.
(Other definitions for amaretto that I've seen before include "Ma, rotate the almond liqueur" , "drink" , "rink" , "Italian almond liqueur" , "Almond-flavoured liqueur" .)