Stones from ring blow over (5)
I believe the answer is:
opals
'stones' is the definition.
(I've seen this before)
'ring blow over' is the wordplay.
'ring' becomes 'O' (letter resembling a ring).
'blow' becomes 'slap' (slap is a kind of blow).
'over' says the letters should be written backwards.
'slap' written backwards gives 'pals'.
'o'+'pals'='OPALS'
'from' acts as a link.
(Other definitions for opals that I've seen before include "jewellery" , "Milky gemstones with delicate colours" , "Iridescent gems" , "Translucent gemstones" , "Milky sparkling gemstones" .)