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Picture may take a goalkeeper by surprise (8)

Ross

I believe the answer is:

snapshot

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

'picture may take a goalkeeper' is the wordplay.
'picture' becomes 'snap' (I've seen this before).
'may take' is a charade indicator (letters next to each other).
'a goalkeeper' becomes 'shot' (I can't justify this - if you can you should believe this answer much more).
'snap'+'shot'='SNAPSHOT'

'by' acts as a link.

Can you help me to learn more?

(Other definitions for snapshot that I've seen before include "Pan hosts over casual photo" , "Quickly taken photograph" , "image" , "Quick photograph" , "Informal photo" .)

I've seen this clue in The Globe and Mail.
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