Preserve expert sides and ring notices for hoppers (4,5)

'hoppers' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'preserve expert sides and ring notices' is the wordplay.
'preserve' becomes 'can' (canning is a kind of preserving).
'sides' says to hollow out the word (remove centre letters) (only the letters on the sides are used).
'and' means one lot of letters go next to another.
'ring' becomes 'O' (letter resembling a ring).
'notices' becomes 'ads' (advertisements).
'expert' with its centre taken out is 'et'.
'can'+'et'+'o'+'ads'='CANE TOADS'

'for' acts as a link.

Can you help me to learn more?