Quiet read, somehow, in common (6)
I believe the answer is:
shared
'in common' is the definition.
(synonyms)
'quiet read somehow' is the wordplay.
'quiet' becomes 'sh' ('sh' is used to tell someone to be quiet).
'somehow' indicates an anagram.
'read' with letters rearranged gives 'ared'.
'sh'+'ared'='SHARED'
(Other definitions for shared that I've seen before include "Jointly owned" , "Communal" , "Went halves" , "Cut" , "Meted out, allotted portions" .)