Frontal supports the quadruped must have, we hear! (8)

I believe the answer is:

forelegs

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'quadruped must have we hear' is the definition.
I can't judge whether this defines the answer.

'frontal supports' is the wordplay.
'frontal' becomes 'fore' (I can't explain this - if you can you should give a lot more credence to this answer).
'supports' becomes 'legs' (leg is a kind of support).
'fore'+'legs'='FORELEGS'

'the' acts as a link.

Can you help me to learn more?

(Another definition for forelegs that I've seen is " Front limbs of a quadruped".)

I've seen this clue in The Irish News.

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