Crossword Genius

Overhead protection from the rain (7)

Ross

I believe the answer is:

hairnet

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

'overhead' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for hairnet that I've seen before include "keeper of locks" , "Mesh worn over the head" , "A woman may wear this" , "It keeps locks in place" , "Headgear" .)

I've seen this clue in The Sun and The Independent.
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