On board, it gives duchesses heart (5)

I believe the answer is:

chess

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'on board' is the definition.
'chess' can be an answer for 'board' (chess board is a kind of board). I am not sure about the 'on' bit.

'it gives duchesses heart' is the wordplay.
'CHESS' is hidden within the letters.
However, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for chess that I've seen before include "Benny Andersson and Bjorn Ulvaeus musical" , "Game involving mates" , "Musical - board game" , "A game of skill" , "Sixteen-men-a-side game" .)

I've seen this clue in the Evening Standard.

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