Shy cattle run off (9)
I believe the answer is:
reluctant
'shy' is the definition.
(thesaurus)
'cattle run off' is the wordplay.
'off' is an anagram indicator.
'cattle'+'run'='cattlerun'
'cattlerun' with letters rearranged gives 'RELUCTANT'.
(Other definitions for reluctant that I've seen before include "not being willing" , "Unwilling to do something" , "Loth" , "Hesitant, disinclined" , "Unwilling, disinclined" .)