Crossword Genius

Barking heads (4)

Ross

I believe the answer is:

nuts

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'heads' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for nuts that I've seen before include "Hard-shelled fruit" , "'Here we go gathering . . . . In May'" , "Mad (slang)" , "Mad - hard fruits" , "One eats these" .)

I've seen this clue in The Telegraph.
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