Crossword Genius

Furrow brow after losing case embraced by politician (6)

Ross

I believe the answer is:

groove

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'furrow' is the definition.
(I know that furrow can be written as groove)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for groove that I've seen before include "Long shallow depression or routine" , "Long thin furrow" , "Long narrow cut in hard material" , "Spiral track followed by a gramophone needle" , "Kind of furrow or rut" .)

I've seen this clue in The Telegraph.
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