Liable to become intoxicated about leading edge in computers, like Macs (8)
I believe the answer is:
scottish
'like macs' is the definition.
(Mac is used in many Scottish surnames)
'liable to become intoxicated about leading edge in computers' is the wordplay.
'liable to become intoxicated' becomes 'sottish' (sot can mean a drunk).
'about' is an insertion indicator.
'leading edge in' suggests taking the first letters (the first of the two edge letters).
The first letter of 'computers' is 'c'.
'sottish' going around 'c' is 'SCOTTISH'.
(Other definitions for scottish that I've seen before include "So stitch up to be like Angus or Jock" , "Costs hit this nationality badly" , "Caledonian" , "tongue" , "from 18 [MORAY], say?" .)