Calm conclusion of Liverpool supporter (5)
I believe the answer is:
easel
'supporter' is the definition.
'calm conclusion of liverpool' is the wordplay.
'calm' becomes 'ease' (ease can mean to calm).
'conclusion of' says to take the final letters.
The final letter of 'liverpool' is 'l'.
'ease'+'l'='EASEL'
(Other definitions for easel that I've seen before include "Painter's support" , "Painter's stand" , "Painting support" , "stand for creativity" , "Studio frame" .)