Listen: shirt cloth is genuine (9)
I believe the answer is:
heartfelt
'is genuine' is the definition.
(thesaurus)
'listen shirt cloth' is the wordplay.
'listen' becomes 'hear' (I've seen this before).
'shirt' becomes 't' (as in a T-shirt).
'cloth' becomes 'felt' (felt is a kind of cloth).
'hear'+'t'+'felt'='HEARTFELT'
(Other definitions for heartfelt that I've seen before include "Profound" , "unfeigned sincerity" , "With sincere passion" , "Most fervent in cardiac way" , "Kindly" .)