Crossword Genius

Dessert wine that may cause rumbling down below later (10)

Ross

I believe the answer is:

aftershock

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'dessert wine that may cause rumbling down below later' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'dessert wine' is the wordplay.
'dessert' becomes 'afters' (afters can mean a dessert course).
'wine' becomes 'hock' (hock is a kind of wine).
'afters'+'hock'='AFTERSHOCK'

Can you help me to learn more?

(Other definitions for aftershock that I've seen before include "that causes another little wobble" , "another shake" , "Secondary earth tremor" , "Ground-breaking" , "What might have cracked open house" .)

I've seen this clue in The Telegraph.
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