Special pointed item for garden bird (7)

I believe the answer is:

sparrow

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

'garden bird' is the definition.
'sparrow' can be an answer for 'bird' (sparrow is a kind of bird). I'm not certain of the 'garden' bit.

'special pointed item' is the wordplay.
'special' becomes 'sp' (abbreviation).
'pointed item' becomes 'arrow' (I am not sure about this - if you are sure you should believe this answer much more).
'sp'+'arrow'='SPARROW'

'for' is the link.

Can you help me to learn more?

(Other definitions for sparrow that I've seen before include "Cock Robin's killer" , "Small songbird" , "A chirrupy city bird" , "Little brown bird" , "Pirate" .)

I've seen this clue in The Guardian.

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