Muscle trouble put right in camp (5)
I believe the answer is:
cramp
'muscle trouble' is the definition.
The answer and definition can be both states of affairs as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'right in camp' is the wordplay.
'right' becomes 'r' (common abbreviation).
'in' is an insertion indicator.
'r' inserted within 'camp' is 'CRAMP'.
'put' is the link.
Can you help me to learn more?
(Other definitions for cramp that I've seen before include "development of vice" , "Confine - muscular spasm" , "Painful muscle problem" , "Severe muscular pain" , "hamper" .)