Object resembling a human to frighten bird? (9)

I believe the answer is:

scarecrow

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

'object resembling a human' is the definition.
I can't tell whether this definition defines the answer.

'frighten bird?' is the wordplay.
'frighten' becomes 'scare' (synonyms).
'bird?' becomes 'crow' (crow is a kind of bird).
'scare'+'crow'='SCARECROW'

'to' is the link.

Can you help me to learn more?

(Other definitions for scarecrow that I've seen before include "Badly dressed person" , "scruff" , "Guy on field" , "Effigy in a field" , "One means of intimidation" .)

I've seen this clue in The Irish Times.

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