Knight soon beaten: these are ill-advised (2-3)

I believe the answer is:

no-nos

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'these are ill-advised' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'knight soon beaten' is the wordplay.
'knight' becomes 'N' (chess abbreviation).
'beaten' is an anagram indicator (letters beaten up or destroyed).
'soon' with letters rearranged gives 'onos'.
'n'+'onos'='NO-NOS'

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(Other definitions for no-nos that I've seen before include "Forbidden actions" , "Forbidden fruits" .)

I've seen this clue in The Sun.

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