Crossword Genius

A single beast isn't exactly a herd! (4)

Ross

I believe the answer is:

head

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

'a single' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for head that I've seen before include "See 12" , "Leader; water pressure" , "Promontory; foam" , "River source; promontory" , "Leader; promontory" .)

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