Mate, armed, assembling perfect ensemble (5,4)
I believe the answer is:
dream team
'perfect ensemble' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'mate armed assembling' is the wordplay.
'assembling' is an anagram indicator.
'mate'+'armed'='matearmed'
'matearmed' anagrammed gives 'DREAM TEAM'.
Can you help me to learn more?
(Other definitions for dream team that I've seen before include "Group considered as perfect for a given task" , "Ideal combination" , "An ideal mix of people" , "Perfect combination of people for a task" .)