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But a blunt question may incur it (5,6)

Ross

I believe the answer is:

sharp answer

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

'blunt question may incur it' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'but a' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

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