Rodent having reason to hoard (6,8)

I believe the answer is:

ground squirrel

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

'rodent' is the definition.
(I know that ground squirrel is a type of squirrel)

'reason to hoard' is the wordplay.
'reason' becomes 'ground' (synonyms).
'to hoard' becomes 'squirrel' (I can't justify this - if you can you should give a lot more credence to this answer).
'ground'+'squirrel'='GROUND-SQUIRREL'

'having' is the link.

Can you help me to learn more?

(Another definition for ground squirrel that I've seen is " rodent".)

I've seen this clue in The Daily Express.

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