Fur knight's taken dishonestly (6)
I believe the answer is:
stolen
'taken dishonestly' is the definition.
(I've seen this before)
'fur knight's' is the wordplay.
'fur' becomes 'stole' (I've seen this in another clue).
'knight' becomes 'n' (chess abbreviation).
'stole'+'n'='STOLEN'
(Other definitions for stolen that I've seen before include "Taken by thieves" , "Hot item" , "Taken without permission or payment" , "` `The ... Child' ' (Yeats)" , "plagiarised?" .)