Sometimes, ketchup improves taste at first - isn't it funny! (4)

I believe the answer is:

skit

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'isn't it funny' is the definition.
I can't judge whether this definition defines the answer.

'sometimes ketchup improves taste at first' is the wordplay.
'at first' indicates taking the first letters.
The first letters of 'sometimes ketchup improves taste' is 'SKIT'.

Can you help me to learn more?

(Other definitions for skit that I've seen before include "Comical sketch" , "Kits for funny play" , "take-off" , "Short satirical performance" , "Burlesque - parody" .)

I've seen this clue in The Irish Times.

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