Computer expert, for short (4)
I believe the answer is:
tech
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">computer expert for short</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tech that I've seen before include "The practical use of science, in short" , "Abbrev. for a college" , "Kind of college" , "College teaching practical skills (informal)" .)