Rudely infers pants easy to get into (4-8)
I believe the answer is:
user-friendly
'easy to get into' is the definition.
'rudely infers pants' is the wordplay.
'pants' indicates anagramming the letters (UK informal term for 'nonsense' or 'rubbish').
'rudely'+'infers'='rudelyinfers'
'rudelyinfers' anagrammed gives 'USER-FRIENDLY'.
(Other definitions for user-friendly that I've seen before include "Easily picked up" , "Easy to understand or manipulate" , "Easy to operate" .)