Admiration as Peter's turned about 100 (7)
I believe the answer is:
respect
'admiration' is the definition.
(thesaurus)
'peter's turned about 100' is the wordplay.
'turned' indicates an anagram.
'about' is an insertion indicator.
'100' becomes 'c' (roman numeral).
'peters' is an anagram of 'respet'.
'respet' enclosing 'c' is 'RESPECT'.
'as' acts as a link.
(Other definitions for respect that I've seen before include "Comply with - deference" , "Observe" , "Pay attention to" , "Appreciation" , "'Regard, esteem (7)'" .)