16 down
Taxi
from
Greece
not
realistic
initially
for
computer
obsessive
(8)
Taxi from Greece not realistic initially for computer obsessive (8)
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The definition is at the end of the clue.
How the clue works
Look at computer obsessive — that's your definition. Taxi gives you UBER (the ride-hailing firm), then take GREEK (as in "from Greece") and drop the R, which is the initial letter of realistic, to leave GEEK. Put them together and you've got your answer.