Wonder Woman's first admitted to A & E (3)
I believe the answer is:
awe
'wonder' is the definition.
(awe is a kind of wonder)
'woman's first admitted to a e' is the wordplay.
'first' indicates taking the first letters.
'admitted to' means one lot of letters goes inside another.
The first letter of 'woman' is 'w'.
'a'+'e'='ae'
'w' placed inside 'ae' is 'AWE'.
(Other definitions for awe that I've seen before include "Overwhelming feeling" , "Scots lock [LOCH??]" , "(Strike with) reverential fear" , "Amazement" , "Reverential feeling" .)