Switch round, and profit by performances (4,5)
I believe the answer is:
take turns
'switch round' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Maybe you can see an association between them that I don't see?
'profit by performances' is the wordplay.
'profit' becomes 'take' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'by' is a charade indicator (letters next to each other).
'performances' becomes 'turns' (a turn is a theatrical performance).
'take'+'turns'='TAKE TURNS'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for take turns that I've seen before include "Alternate" , "Participate in rotation" , "in sequence" , "Work on an alternating basis" , "share the driving, say" .)