About suntraps being popular with birds (5)

I believe the answer is:

nests

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

'birds' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe 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 nests that I've seen before include "Bird houses" , "Sets of small tables that fit closely together" , "Settles comfortably into, as birds do" , "Cosy secluded retreats" , "Tables made to fit closely together" .)

I've seen this clue in the Evening Standard.

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