Twice walked over, being cheated (6-7)

I believe the answer is:

double-crossed

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'being cheated' is the definition.
(I've seen this before)

'twice walked' is the wordplay.
'twice' becomes 'double' (synonyms).
'walked' becomes 'crossed' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'double'+'crossed'='DOUBLE-CROSSED'

'over' is the link.

Can you help me to learn more?

(Other definitions for double-crossed that I've seen before include "Cheated by one's own agent" , "Deceived" .)

I've seen this clue in The Times.

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