Mark has loud cravat (5)
I believe the answer is:
scarf
'cravat' is the definition.
(thesaurus)
'mark has loud' is the wordplay.
'mark' becomes 'scar' ('scar' can be a synonym of 'mark').
'has' says to put letters next to each other.
'loud' becomes 'f' (A musical term).
'scar'+'f'='SCARF'
(Other definitions for scarf that I've seen before include "Neck warmer" , "Garment worn around head or neck" , "joint > chaplaincy" , "Something worn around the head or neck and shoulders" , "Warming garment" .)