Her caper disturbed a clergyman (8)
I believe the answer is:
preacher
'a clergyman' is the definition.
(preacher is a kind of clergyman)
'her caper disturbed' is the wordplay.
'disturbed' indicates anagramming the letters.
'her'+'caper'='hercaper'
'hercaper' anagrammed gives 'PREACHER'.
(Other definitions for preacher that I've seen before include "Sermoniser; minister" , "One spreading religious message" , "Religious minister" , "Religious speaker" , "He may drone on" .)