Crossword Genius

Set great store by (5)

Ross

I think it could be either:

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5

7

hoarded

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'set great' is the definition.
I can't tell whether this defines the answer.

'store by' is the wordplay.
'store' becomes 'hoard' (hoard is a kind of store).
'by' becomes 'ed' (I can't explain this - if you can you should believe this answer much more).
'hoard'+'ed'='HOARDED'

Can you help me to learn more?

(Other definitions for hoarded that I've seen before include "Stored up" , "Collected" , "Amassed" , "Squirrelled away" , "Salted away" .)

I've seen this clue in The Globe and Mail.
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