Crossword Genius

Blanket agreement joins basic political adversaries (5)

Ross

I believe the answer is:

layer

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

'blanket' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?

'agreement joins basic political adversaries' is the wordplay.
I cannot quite understand how this works, but
'agreement' could be 'ay' and 'ay' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for layer that I've seen before include "Thickness of material or earth - relay it" , "Tier or thickness - or a hen?" , "Single thickness, tier" , "Productive chicken" , "course" .)

I've seen this clue in The Guardian.
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