Crossword Genius

Game prince over how he addressed Mary de Bohun? (5)

Ross

I believe the answer is:

halma

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'game' is the definition.
(board game)

'prince over how he addressed mary de bohun?' is the wordplay.
I cannot really see how this works, but
'prince' could be 'hal' (Shakespearean nickname of Henry V when a prince) and 'hal' is present in the answer.
The remaining letters 'ma' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for halma that I've seen before include "Leaping board game" , "Old board game" , "Hopping board game" , "played on board" , "Board-game" .)

I've seen this clue in The Times.
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