Adult, married, full of wonder (4)
I believe the answer is:
awed
'full of wonder' is the definition.
(I've seen this before)
'adult married' is the wordplay.
'adult' becomes 'a'.
'married' becomes 'wed' ('wed' can be similar in meaning to 'married').
'a'+'wed'='AWED'
(Other definitions for awed that I've seen before include "Filled with respect (or dread)" , "Seriously impressed" , "Cowed" , "in terror" , "Filled with reverential wonder" .)