Arrange coat for strange sheep (3,2)
I believe the answer is:
set up
'arrange' is the definition.
(synonyms)
'coat for strange sheep' is the wordplay.
'coat for' means to remove the middle letters (the letters which coat the word).
'sheep' becomes 'tup' (tup is a kind of sheep).
'strange' with its middle taken out is 'se'.
'se'+'tup'='SET-UP'
(Other definitions for set up that I've seen before include "Contrived situation" , "Exalt - arrange - begin" , "An arrangement designed to trap or cheat" , "Erect; fix" , "a useful situation at tennis?" .)