Protective garment for a quiet fellow (5)
I believe the answer is:
apron
'protective garment' is the definition.
(apron is a kind of protective garment)
'a quiet fellow' is the wordplay.
'a quiet' becomes 'ap' (I've seen this in other clues).
'fellow' becomes 'ron' (masculine given name**).
'ap'+'ron'='APRON'
'for' acts as a link.
(Other definitions for apron that I've seen before include "Airport area for manoeuvring and loading planes" , "Protective garment worn at front" , "Cook's protector" , "Garment traditionally worn by mother" , "Part of stage, boxing ring or airport terminal" .)