Crossword Genius

Packed fur at great speed (4,4)

Ross

I believe the answer is:

full pelt

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

'great speed' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'packed fur' is the wordplay.
'packed' becomes 'full' (synonyms).
'fur' becomes 'pelt' (synonyms).
'full'+'pelt'='FULL-PELT'

'at' is the link.

Can you help me to learn more?

(Another definition for full pelt that I've seen is " As fast as possible".)

I've seen this clue in the Sydney Morning Herald.
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