Crossword Genius

Correct old law (5)

Ross

I believe the answer is:

exact

'correct' is the definition.
('exact' can be similar in meaning to 'correct')

'old law' is the wordplay.
'old' becomes 'ex'.
'law' becomes 'act' (I've seen this before).
'ex'+'act'='EXACT'

(Other definitions for exact that I've seen before include "Precise; extort" , "Completely accurate" , "accurate in all details" , "Spot-on" , "far from improvised?" .)

I've seen this clue in The Guardian.
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