Pay up front to be getting on section of website (4)
I believe the answer is:
page
'section of website' is the definition.
(a web page)
'pay up front to be getting on' is the wordplay.
'up front' indicates taking the first letters (the letter at the front of the word).
'to be getting on' becomes 'age' (someone 'getting on' is getting older).
The first letter of 'pay' is 'p'.
'p'+'age'='PAGE'
(Other definitions for page that I've seen before include "Young hotel employee" , "errand-boy" , "contact" , "Messenger" , "Summon" .)