Well informed cast for a movie (2,3,7)
I believe the answer is:
in the picture
'well informed cast' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'for a movie' is the wordplay.
'for a' becomes 'inthe' (I can't justify this - if you can you should give a lot more credence to this answer).
'movie' becomes 'picture' (synonyms).
'inthe'+'picture'='IN THE PICTURE'
Can you help me to learn more?
(Other definitions for in the picture that I've seen before include "where stars may be seen?" , "Film star is" , "what the subject of a portrait must be" , "Knowing" , "stars' location" .)