Colt Ron disturbed showing restraint (7)
I believe the answer is:
control
'restraint' is the definition.
(synonyms)
'colt ron disturbed' is the wordplay.
'disturbed' is an anagram indicator (the order of letters is disturbed).
'colt'+'ron'='coltron'
'coltron' with letters rearranged gives 'CONTROL'.
'showing' acts as a link.
(Other definitions for control that I've seen before include "Regulate with self-possession?" , "Power to restrain or regulate" , "Mastery" , "Exercise power over" , "Keep in line" .)