It's on the cards that one may improve (3,4)
I believe the answer is:
get well
'improve' is the definition.
(getting well is a kind of improving)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for get well that I've seen before include "Recover from illness" , "Recover one's health" .)
I've seen this clue in the Evening Standard.
Want a hint initially instead of a full solution?
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