Crossword Genius

Careful about tinned food? (5)

Ross

I believe the answer is:

canny

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'careful' is the definition.
(I've seen this in another clue)

'about tinned food?' is the wordplay.
'about' becomes 'c' (abbreviation for circa).
'tinned food?' becomes 'anny' (I can't justify this - if you can you should believe this answer much more).
'c'+'anny'='CANNY'

Can you help me to learn more?

(Other definitions for canny that I've seen before include "Shrewd, knowing" , "Fly" , "Shrewd, clever" , "Shrewd like Scotsman" , "Worldly-wise" .)

I've seen this clue in the Evening Standard.
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