Friend set up better mobile device (6)

I believe the answer is:

laptop

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'mobile device' is the definition.
'laptop' can be an answer for 'device' (laptop is a kind of device). I'm not sure about the 'mobile' bit.

'friend set up better' is the wordplay.
'friend' becomes 'pal' (pal can mean a friend).
'set up' says the letters should be written in reverse (in a down clue, letters go up).
'better' becomes 'top' (top can mean to better or outdo).
'pal' backwards is 'lap'.
'lap'+'top'='LAPTOP'

Can you help me to learn more?

(Other definitions for laptop that I've seen before include "Type of computer" , "Portable computer" , "device?" , "Aid for businessman" , "Some work on this" .)

I've seen this clue in The Sun and The Telegraph.

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