Learn about putting actors in bomber (9)
I believe the answer is:
lancaster
'bomber' is the definition.
(Avro Lancaster was a WW2 bomber plane)
'learn about putting actors in' is the wordplay.
'about' indicates anagramming the letters.
'putting actors' becomes 'cast' (I can't explain this - if you can you should give a lot more credence to this answer).
'in' is an insertion indicator.
'learn' with letters rearranged gives 'laner'.
'laner' enclosing 'cast' is 'LANCASTER'.
Can you help me to learn more?
(Other definitions for lancaster that I've seen before include "historic city" , "English city's" , "House involved in the Wars of the Roses" , "Duke" , "WW2 aircraft; city" .)