Law officer tricks board (9)

I believe the answer is:

constable

'law officer' is the definition.
(constable is a kind of law officer)

'tricks board' is the wordplay.
'tricks' becomes 'cons' (I've seen this before).
'board' becomes 'table' (synonyms).
'cons'+'table'='CONSTABLE'

(Other definitions for constable that I've seen before include "British painter and police officer" , "Did he have a brush" , "He painted" , "Policeman - landscape artist" , "Artist; police officer" .)

I've seen this clue in The Telegraph.

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