The last word I caught back in picture palace (6)
I believe the answer is:
cinema
'picture palace' is the definition.
('cinema' can be a synonym of 'picture palace')
'the last word i caught back' is the wordplay.
'the last word' becomes 'amen' (I've seen this before).
'caught' becomes 'c' (cricket abbreviation).
'back' says the letters should be written in reverse.
'amen'+'i'+'c'='amenic'
'amenic' reversed gives 'CINEMA'.
'in' acts as a link.
(Other definitions for cinema that I've seen before include "Film theatre" , "The big screen" , "The flicks" , "Where films are shown" , "(Building for) film" .)