Brainless model's second caution about racket? (9)

I believe the answer is:

scarecrow

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'brainless model's' is the definition.
(type of model)

'second caution about racket?' is the wordplay.
'second' becomes 's' (common abbreviation).
'caution' becomes 'care' (synonyms).
'about racket?' becomes 'crow' (I am not sure about this - if you are sure you should believe this answer much more).
's'+'care'+'crow'='SCARECROW'

Can you help me to learn more?

(Other definitions for scarecrow that I've seen before include "Badly dressed person" , "Man of straw" , "scruff" , "One in 5d's party" , "he's shabbily dressed" .)

I've seen this clue in The Telegraph.

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