Crossword Genius

Excited cry from oaf (5)

Ross

I believe the answer is:

yahoo

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

'oaf' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see a link between them that I can't see?

'excited cry from' is the wordplay.
'excited' becomes 'ya' (I can't justify this - if you can you should give a lot more credence to this answer).
'cry' becomes 'Ho'.
'from' becomes 'o' (I've seen this in other clues).
'ya'+'ho'+'o'='YAHOO'

Can you help me to learn more?

(Other definitions for yahoo that I've seen before include "Ugly swipe at delivery" , "In novel, brute" , "Rude or brutish person" , "crude fellow" , "Brute; hurrah" .)

I've seen this clue in The Guardian.
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