Sources close to Boris expect 'EU done' spiel at summits (5)

I believe the answer is:

seeds

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

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

I don't understand the remainder of the clue.

(Other definitions for seeds that I've seen before include "Small hard fruit" , "top tennis players" , "Pips" , "favourites for the trophy?" , "Small hard fruits" .)

I've seen this clue in The Independent.

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