Crossword Genius

Describing every detail, expose illegitimate child (4-2-4)

Ross

I believe the answer is:

blow-by-blow

'describing every detail' is the definition.
(as in a blow-by-blow account)

'expose illegitimate child' is the wordplay.
'expose' becomes 'blow' (as in blowing someone's cover).
'illegitimate child' becomes 'byblow' (by-blow can mean an illegitimate child).
'blow'+'byblow'='BLOW-BY-BLOW'

(Other definitions for blow-by-blow that I've seen before include "Comprehensive" , "Recounted in (whopping?) detail" , "Giving all details as they happened" , "boxing?" , "Explained in great detail" .)

I've seen this clue in The Times.
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