Teased about being placid (6)
I believe the answer is:
sedate
'placid' is the definition.
(I've seen this in another clue)
'teased about' is the wordplay.
'about' indicates anagramming the letters.
'teased' anagrammed gives 'SEDATE'.
'being' is the link.
(Other definitions for sedate that I've seen before include "Calm; put to sleep" , "Calm, unhurried" , "Dignified - staid" , "Calm and demure" , "Quiet and dignified" .)