Supporting Elbow, for example, performing in Belgium (4)
I believe the answer is:
bone
'supporting elbow for example' is the definition.
I can't tell whether this defines the answer.
'performing in belgium' is the wordplay.
'performing' becomes 'on' (as in being on stage).
'in' is an insertion indicator.
'belgium' becomes 'be' (I've seen this in other clues).
'on' going within 'be' is 'BONE'.
Can you help me to learn more?
(Other definitions for bone that I've seen before include "#Close to it is risque" , "Part of skeleton" , "How dry" , "Skeleton substance" , "It makes up the skeleton" .)