Rudely infers travelling is easy to manage (4-8)

I believe the answer is:

user-friendly

I'm a little stuck... Click here to teach me more about this clue!

'easy to manage' is the definition.
I can't judge whether this defines the answer.

'rudely infers travelling' is the wordplay.
'travelling' indicates anagramming the letters.
'rudely'+'infers'='rudelyinfers'
'rudelyinfers' with letters rearranged gives 'USER-FRIENDLY'.

'is' is the link.

Can you help me to learn more?

(Other definitions for user-friendly that I've seen before include "Easy to understand or manipulate" , "Easy to operate" , "Easily picked up" .)

I've seen this clue in The Times.

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