Crossword Genius

Bill for example that is unusually desirable (8)

Ross

I believe the answer is:

eligible

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'desirable' is the definition.
(similar in meaning)

I don't understand the remainder of the clue.

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(Other definitions for eligible that I've seen before include "Fit to be chosen" , "Flashing lamp" , "Desirable as a spouse" , "Qualified to be chosen, say a bachelor" , "Worthy to be chosen" .)

I've seen this clue in The Globe and Mail.
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