Self-control shown by others surrounding coach (9)
I believe the answer is:
restraint
'self-control' is the definition.
(thesaurus)
'others surrounding coach' is the wordplay.
'others' becomes 'rest' (I've seen this before).
'surrounding' is an insertion indicator.
'coach' becomes 'train' ('train' can be a synonym of 'coach').
'rest' enclosing 'train' is 'RESTRAINT'.
'shown by' acts as a link.
(Other definitions for restraint that I've seen before include "Start rain as an impediment" , "Self-discipline" , "Restriction, limit" , "Moderation" , "Check" .)