Shoulder muscle twisted in a court (6)
I believe the answer is:
accept
'shoulder' is the definition.
(thesaurus)
'muscle twisted in a court' is the wordplay.
'muscle' becomes 'pec' (pectoral muscle).
'twisted' shows that the letters should be reversed in order.
'in' indicates putting letters inside.
'court' becomes 'ct' (abbreviation used in road names).
'pec' written backwards gives 'cep'.
'a'+'ct'='act'
'cep' going inside 'act' is 'ACCEPT'.
(Other definitions for accept that I've seen before include "Take up, obtain" , "Consider or hold as true" , "Welcome" , "Acknowledge" , "Receive something proffered" .)