Wade about, open-mouthed (4)
I believe the answer is:
awed
'open-mouthed' is the definition.
(I've seen this in another clue)
'wade about' is the wordplay.
'about' indicates anagramming the letters.
'wade' is an anagram of 'AWED'.
(Other definitions for awed that I've seen before include "Full of wonder" , "Inspired with wonder" , "Impressed deeply" , "Struck with fear/wonder" , "Cowed" .)