Be framing a picture of the old prison (8)
I believe the answer is:
bastille
'the old prison' is the definition.
(historical French prison)
'be framing a picture' is the wordplay.
'framing' is an insertion indicator (inserted letters are framed by the outside letters).
'picture' becomes 'still' (still is a kind of picture).
'a'+'still'='astill'
'be' going around 'astill' is 'BASTILLE'.
'of' acts as a link.
(Other definitions for bastille that I've seen before include "French fortress" , "Building stormed in Paris" , "Notorious Paris prison stormed in French revolution" , "Ballet is about notorious prison in Paris" , "Old fortress" .)