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A sheaf of corn that comes as a surprise (1,3,2,1,5)

Ross

I believe the answer is:

a bit of a shock

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

'a surprise' is the definition.
(I've seen this before)

'a sheaf of corn that comes as' is the wordplay.
I cannot quite understand how this works, but
'a' is within the answer.
'of' could be 'o' and 'o' is located in the answer.
'as' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for a bit of a shock that I've seen is " a surprise".)

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