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A close relation? Do him in if misbehaving (7)

Ross

I believe the answer is:

hominid

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'a close relation?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'do him in if misbehaving' is the wordplay.
'do him in' anagrams to 'HOMINID'.
But, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for hominid that I've seen before include "Man or manlike creature" , "Old man" , "Man, including fossil types" , "Fossil human" , "Member of zoological family of humans and ancestors" .)

I've seen this clue in The Times.
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