Top-class cook making trouble (3)
I believe the answer is:
ado
'trouble' is the definition.
(both can mean bother or commotion)
'top-class cook' is the wordplay.
'top class' becomes 'a' (top grade).
'cook' becomes 'do' (do can mean to cook).
'a'+'do'='ADO'
'making' is the link.
(Other definitions for ado that I've seen before include "Nothing caused much around 1598" , "Fuss, bother" , "stew is provided" , "'Much ... About Nothing, Shakespeare play (3)'" , "Flap" .)