Crossword Genius

King helpfully losing second with regret (8)

Ross

I believe the answer is:

ruefully

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'with regret' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

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(Other definitions for ruefully that I've seen before include "In a wryly regretful way" , "Loaded with regret" , "Contritely, remorsefully" , "In regretful or doleful way" , "Sorrowfully" .)

I've seen this clue in The Telegraph.
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