Regularly on it, managed to get drunk (5)
I believe the answer is:
oiled
'get drunk' is the definition.
(I've seen this before)
'regularly on it managed' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'managed' becomes 'led' (lead can mean to manage or be in charge).
'on'+'it'='onit'
The alternating letters of 'onit' are 'oi'.
'oi'+'led'='OILED'
'to' acts as a link.
(Other definitions for oiled that I've seen before include "Lubricated (with drink?)" , "running smoothly?" , "as silk may be" , "tipsy" , "get drunk" .)