Cry over nice house ruined, where synthetic gas explosion comes from (7,7)

I believe the answer is:

whoopee cushion

I'm a little stuck... Click here to teach me more about this clue!

'where synthetic gas explosion comes from' is the definition.
The definition suggests a singular noun which matches the answer.

'cry over nice house ruined' is the wordplay.
'cry' becomes 'whoop' (whooping is a kind of crying).
'over' is a charade indicator (letters next to each other) (in a down clue, some letters go over others).
'ruined' indicates an anagram.
'nice'+'house'='nicehouse'
'nicehouse' anagrammed gives 'eecushion'.
'whoop'+'eecushion'='WHOOPEE CUSHION'

Can you help me to learn more?

(Other definitions for whoopee cushion that I've seen before include "source of juvenile amusement" , "Inflatable source of much mirth?" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.