Last word I caught written up for film (6)
I believe the answer is:
cinema
'film' is the definition.
(synonyms)
'last word i caught written up' is the wordplay.
'last word' becomes 'amen' (last word in a prayer).
'caught' becomes 'c' (cricket abbreviation).
'written up' shows that the letters should be reversed in order.
'amen'+'i'+'c'='amenic'
'amenic' in reverse letter order is 'CINEMA'.
'for' acts as a link.
(Other definitions for cinema that I've seen before include "Film theatre" , "Movie theatre" , "Place of entertainment" , "(Building for) film" , "The flicks" .)