Hides rocky rubble next to rear parts of garden beds (7)

I believe the answer is:
screens
'hides' is the definition.
(I've seen this in another clue)
'rocky rubble next to rear parts of garden beds' is the wordplay.
'rocky rubble' becomes 'scree' (I've seen this in another clue).
'next to' is a charade indicator (letters next to each other).
'rear' shows that the letters should be reversed in order (I've seen 'rearing' mean this (as in a horse rearing up)).
'parts of garden beds' becomes 'sn' (I can't justify this - if you can you should give a lot more credence to this answer).
'sn' written backwards gives 'ns'.
'scree'+'ns'='SCREENS'
Can you help me to learn more?
(Other definitions for screens that I've seen before include "vets" , "Shows on the telly" , "Checks" , "Covers to conceal" , "for security guards" .)
