Come down on playground item and collapse (9)
I believe the answer is:
landslide
'collapse' is the definition.
The definition and answer can be both related to natural events as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'come down on playground item' is the wordplay.
'come down' becomes 'land' (to land is to come down after flying).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'playground item' becomes 'slide' (I've seen this in another clue).
'land'+'slide'='LANDSLIDE'
'and' is the link.
Can you help me to learn more?
(Other definitions for landslide that I've seen before include "Overwhelming victory in election, or a natural disaster" , "Huge majority at election" , "Massive election win" , "big victory" , "Large earth movement" .)