Crossword Genius

Cherish floating voter that was collected by 9? (8-5)

Ross

I believe the answer is:

treasure-trove

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

'was collected by 9?' is the definition.
I can't judge whether this definition defines the answer.

'cherish floating voter' is the wordplay.
'cherish' becomes 'treasure' ('treasure' can be a synonym of 'cherish').
'floating' is an anagram indicator (float can mean fluctuate or oscillate).
'voter' anagrammed gives 'trove'.
'treasure'+'trove'='TREASURE-TROVE'

'that' is the link.

Can you help me to learn more?

(Other definitions for treasure-trove that I've seen before include "Hidden store of valuables" , "lots of good things" , "Collection of delightful things" , "Valuables found hidden" .)

I've seen this clue in The Telegraph.
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