Crossword Genius

Lord’s wife and son are unknown (4)

Ross

I believe the answer is:

lady

'lord's wife' is the definition.
(I've seen this in another clue)

'son are unknown' is the wordplay.
'son' becomes 'lad' (lad can mean a boy or son).
'are unknown' becomes 'y' (algebra).
'lad'+'y'='LADY'

'and' acts as a link.

(Other definitions for lady that I've seen before include "Gentlewoman" , "Luck, for example" , "See 7" , "mature woman" , "Noble" .)

I've seen this clue in The Mirror.
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