Excited cry from oaf (5)
I believe the answer is:
yahoo
'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" .)