Wonder how it's a sound alternative (3)
I believe the answer is:
awe
'wonder' is the definition.
(awe is a kind of wonder)
'it's a sound alternative' is the wordplay.
'sound alternative' becomes 'we' (I can't explain this - if you can you should give a lot more credence to this answer).
'a'+'we'='AWE'
'how' is the link.
Can you help me to learn more?
(Other definitions for awe that I've seen before include "Sense of wonder" , "Wonderment" , "Great dread" , "(Strike with) reverential fear" , "A mix of fear and wonder" .)