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As experts, they're well served (4)


I believe the answer is:


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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for aces that I've seen before include "Ones or elevens in cards" , "never come back" , "Expert fliers" , "Unreturnable services" , "They're high and low on cards" .)

I've seen this clue in the Evening Standard.
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