Fleece covering English gown (4)
I believe the answer is:
robe
'gown' is the definition.
(I know that robe is a type of gown)
'fleece covering english' is the wordplay.
'fleece' becomes 'rob' (synonyms).
'covering' is a charade indicator (letters next to each other) (in a down clue, some letters go on top of others).
'english' becomes 'E' (abbreviation).
'rob'+'e'='ROBE'
(Other definitions for robe that I've seen before include "Clerical garment" , "habit" , "judge's garment" , "Ceremonial garb" , "Old cloak for Boer" .)