Servant mixed up with lodger in film (2,11)
I believe the answer is:
dr strangelove
'film' is the definition.
(I have seen 'satirical film' mean 'dr strangelove' so perhaps 'film' could also mean 'dr strangelove')
'servant mixed up with lodger' is the wordplay.
'mixed up with' indicates anagramming the letters.
'servant' mixed up with 'lodger' can make 'DR STRANGELOVE'.
'in' acts as a link.
(Other definitions for dr strangelove that I've seen before include "Peter Sellers film role" , "satirical film" .)