Huge masculine chaps getting in Pilsner regularly (7)
I believe the answer is:
immense
'huge' is the definition.
(I know that huge can be written as immense)
'masculine chaps getting in pilsner regularly' is the wordplay.
'masculine' becomes 'm'.
'chaps' becomes 'men' (chap means a man).
'getting in' is an insertion indicator.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternating letters of 'pilsner' are 'ise'.
'm'+'men'='mmen'
'mmen' going into 'ise' is 'IMMENSE'.
(Other definitions for immense that I've seen before include "Unctuously ingratiating" , "Extremely large or great" , "Superb" , "Huge, vast" , "Huge, really great" .)