Crossword Genius

First son upset in nightclub (4)

Ross

I believe the answer is:

spot

'nightclub' is the definition.

'first son upset' is the wordplay.
'first' becomes 'top' (top can mean the best or first).
'son' becomes 's' (genealogical abbreviation for son).
'upset' is a reversal indicator.
'top'+'s'='tops'
'tops' written backwards gives 'SPOT'.

'in' is the link.

(Other definitions for spot that I've seen before include "See - blemish" , "Notice - stain - pick out" , "Dot, stain" , "Lady Macbeth: ''Out, damned . . . .!''" , "See; location" .)

I've seen this clue in The Sun.
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