Smart hotshot bottling anger about computer connection (9)
I believe the answer is:
interface
'computer connection' is the definition.
'interface' can be an answer for 'connection' (thesaurus). I'm not certain of the 'computer' bit.
'smart hotshot bottling anger about' is the wordplay.
'smart' becomes 'in' (as in fashionable).
'hotshot' becomes 'ace' ('ace' can be a synonym of 'hotshot').
'bottling' indicates putting letters inside (bottling is a kind of containing).
'anger' becomes 'fret' (I am not sure about this - if you are sure you should believe this answer much more).
'about' says the letters should be written in reverse.
'fret' reversed gives 'terf'.
'in'+'ace'='inace'
'inace' enclosing 'terf' is 'INTERFACE'.
Can you help me to learn more?
(Other definitions for interface that I've seen before include "Windows, for example" , "Meeting point" , "meeting-point" , "Boundary" , "Point where two things meet" .)