See director with Ms Blanchett on set (7)
I believe the answer is:
located
'set' is the definition.
(synonyms)
'see director with ms' is the wordplay.
'see' becomes 'lo' (archaic exclamation meaning 'look!').
'director' becomes 'd' (abbreviation eg in film reviews).
'with' is a charade indicator (letters next to each other).
'ms' becomes 'cate' (I am not sure about this - if you are sure you should believe this answer much more).
'd' put after 'cate' is 'cated'.
'lo'+'cated'='LOCATED'
'blanchett on' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for located that I've seen before include "Settled -- cold tea (anag)" , "Found" , "Sited" , "Situated in a particular spot" , "Discovered where something was" .)