Crossword Genius

What to exclaim when an article has the end cut off! (3)

Ross

I believe the answer is:

aha

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

'what' is the definition.
Both the answer and definition are interjections.
Maybe you can see a link between them that I don't see?

'exclaim when an article has the end cut off' is the wordplay.
I cannot quite understand how this works, but
'an' could be 'a' and 'a' is located in the answer.
'article' could be 'a' (the indefinite article in English) and 'a' is located in the answer.
A single letter 'h' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'to' is the link.

Can you help me to learn more?

(Other definitions for aha that I've seen before include "Expression of surprise, satisfaction or triumph" , "Bingo" , "Triumphant cry" , "Exclamation of triumph or mockery, a palindrome" , "Surprised expression" .)

I've seen this clue in the Evening Standard.
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