Society speaks of shadows (6)
I believe the answer is:
stalks
'shadows' is the definition.
(stalking is a kind of shadowing)
'society speaks' is the wordplay.
'society' becomes 's' (common abbreviation in names of organisations).
'speaks' becomes 'talks' ('talk' can be a synonym of 'speak').
's'+'talks'='STALKS'
'of' is the link.
(Other definitions for stalks that I've seen before include "'Stems, plant supports (6)'" , "Tracks or pursues stealthily" , "Follows or tracks stealthily, game or victim" , "Follows stealthily with evil intent" , "Hunts" .)