Crossword Genius

Creature like Tarka having higher temperature in Bow? (5)

Ross

I believe the answer is:

otter

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

'having higher temperature in bow?' is the definition.
('hotter' - I've seen this before - said with the 'H' dropped - a cockney accent.)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for otter that I've seen before include "Sleek river mammal" , "Carnivorous aquatic mammal" , "furry animal" , "Lithe swimmer" , "Fish-eating water animal with brown fur and flat tail" .)

I've seen this clue in The Times.
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