Solver that is audible in greeting (3-3)
I believe the answer is:
yoo-hoo
'greeting' is the definition.
The definition and answer are not the same part of speech.
'solver that is audible' is the wordplay.
'solver' becomes 'yoo' (I can't justify this - if you can you should believe this answer much more).
'that' becomes 'who' (the person that..., the person who...).
'is audible' shows a homophone (sound like).
'who' sounds like 'hoo'.
'yoo'+'hoo'='YOO-HOO'
'in' is the link.
Can you help me to learn more?
(Another definition for yoo-hoo that I've seen is " Call to gain attention".)