Article in favour of new protective gear (5)
I believe the answer is:
apron
'protective gear' is the definition.
'article in favour of new' is the wordplay.
'article' becomes 'a' (English indefinite article).
'in favour of' becomes 'pro' (being pro a particular cause).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'a'+'pro'+'n'='APRON'
(Other definitions for apron that I've seen before include "Kitchen garment or airfield surface." , "Pinafore" , "Kitchen garment or part of airfield" , "Protective garment (with strings attached!)" , "Paved surface where aircraft stand when not in use" .)