Crossword Genius

Quiet! Corsairs out focusing lines (5,5)

Ross

I believe the answer is:

cross hairs

I'm a little stuck... Click here to teach me more about this clue!

'lines' is the definition.
(I know this)

'quiet corsairs out focusing' is the wordplay.
I cannot really understand how this works, but
'quiet' could be 'sh' (both can be said to tell someone to be quiet) and 'sh' is located in the answer.
an anagram of 'corsairs' is 'crosairs' which is within the left over letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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