Admit working full of whiskey (3)
I believe the answer is:
own
'admit' is the definition.
(own can mean to admit or acknowledge)
'working full of whiskey' is the wordplay.
'working' becomes 'on' (on can mean working or activated).
'full of' indicates putting letters inside.
'whiskey' becomes 'W' (alpha bravo charlie delta ...).
'on' going around 'w' is 'OWN'.
(Other definitions for own that I've seen before include "Have in one's possession" , "Allow" , "Control" , "Possess - recognise - admit" , "Posses" .)