Crossword Genius

Animal's sound advice for boating companion? (3,4)

Ross

I believe the answer is:

roe deer

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'animal's' is the definition.
(type of animal)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for roe deer that I've seen before include "Graceful creature in river captured by heartless oarsman" , "Small Eur. ruminant" , "Countryside mammal" , "Forest animal" , "Small cervid mammal" .)

I've seen this clue in The Sun.
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