Better protected by circuits in computers (7)
I believe the answer is:
laptops
'computers' is the definition.
(laptop is a kind of computer)
'better protected by circuits' is the wordplay.
'better' becomes 'top' (I've seen this in other clues).
'protected by' is an insertion indicator.
'circuits' becomes 'laps' ('lap' can be a synonym of 'circuit').
'top' going into 'laps' is 'LAPTOPS'.
'in' acts as a link.
(Other definitions for laptops that I've seen before include "Portable computers" , "PCs" , "more than one PC" .)