Son in stew going to fashionable night club (3,4)

I believe the answer is:

hot spot

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'fashionable night club' is the definition.
The definition suggests a singular noun which matches the answer.

'son in stew' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'in' is an insertion indicator.
'stew' becomes 'hotpot' (I've seen this before).
's' put inside 'hotpot' is 'HOT SPOT'.

'going to' is the link.

Can you help me to learn more?

(Other definitions for hot spot that I've seen before include "Where danger lurks" , "Dangerous place" , "Area of high temperature" , "Place of significant danger" , "Potential flashpoint" .)

I've seen this clue in The Independent.

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