Enterprise, reorganising, must face Eastern outfit (7)
I believe the answer is:
costume
'outfit' is the definition.
(thesaurus)
'enterprise reorganising must face eastern' is the wordplay.
'enterprise' becomes 'co' (company).
'reorganising' indicates an anagram.
'face' says to take the initial letters (I've seen 'face of' mean this).
The first letter of 'eastern' is 'e'.
'must' with letters rearranged gives 'stum'.
'co'+'stum'+'e'='COSTUME'
(Other definitions for costume that I've seen before include "Actor's attire" , "Duds" , "Theatrical clothes" , "Actor's set of clothes" , "Clothes for a play or fancy dress ball" .)