Teach a tip about being unmoved (9)
I believe the answer is:
apathetic
'unmoved' is the definition.
(thesaurus)
'teach a tip about' is the wordplay.
'about' indicates an anagram.
'teach'+'a'+'tip'='teachatip'
'teachatip' with letters rearranged gives 'APATHETIC'.
'being' is the link.
(Other definitions for apathetic that I've seen before include "Lacking passion" , "Uncaring, uninterested" , "Indifferent - without emotion" , "Showing no emotion or interest" , "showing no enthusiasm" .)