Project leader gets to brief Man-with-a-Van (5,5)
I believe the answer is:
prime mover
'project leader' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?
'brief man-with-a-van' is the wordplay.
'brief' becomes 'prime' (I've seen this before).
'man-with-a-van' becomes 'mover' (I can't explain this - if you can you should believe this answer much more).
'prime'+'mover'='PRIME MOVER'
'gets to' is the link.
Can you help me to learn more?
(Other definitions for prime mover that I've seen before include "original author" , "Chief instigator" .)