Good player selected but disheartened? (4)

I believe the answer is:

seed

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'good player' is the definition.
'seed' can be an answer for 'player' (seed is a kind of player). I am not sure about the 'good' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for seed that I've seen before include "offspring" , "Pip - source - children" , "Biblical children" , "favourite player" , "Top Wimbledon player" .)

I've seen this clue in the Evening Standard.

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