Gobsmack (3)
(Other definitions for awe that I've seen before include "Amazed wonder" , "Reverent fear" , "Wonderment" , "Fearful respect" , "Fear/wonder feeling" .)
'gobsmack' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for wow that I've seen before include "Expression of amazement" , "Exclamation of admiration - another palindrome" , "Palindromic exclamation of surprise or admiration" , "that's incredible!" , "Impress hugely" .)