Little Dorothy embraces large fool (4)
I believe the answer is:
dolt
'fool' is the definition.
(I know that fool can be written as dolt)
'little dorothy embraces large' is the wordplay.
'little dorothy' becomes 'dot' (nickname for Dorothy).
'embraces' indicates putting letters inside.
'large' becomes 'L' (eg in clothes sizes).
'dot' going around 'l' is 'DOLT'.
(Other definitions for dolt that I've seen before include "Blockhead" , "Halfwit" , "Dimwit" , "Slow-witted person" , "Dullard" .)