The most common and most likely answer to this crossword clue is the 10 letter word LEFT-CLICK
I've seen this crossword clue in The Guardian
L
E
F
T
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C
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K
Buddy explains!
The straight part
We know that "As a computer operator, touch/As a computer operator, touch" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case as a computer operator, touch/as a computer operator, touch = left-click.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does LEFT-CLICK mean?
LEFT-CLICK verb- To press the left button on a computer mouse.
- To activate an item on the screen by left-clicking while the pointer is over it.