Old printing apparatus, say (7)
I believe the answer is:
express
'say' is the definition.
(to express something is to say it)
'old printing apparatus' is the wordplay.
'old' becomes 'ex' (prefix meaning former or onetime).
'printing apparatus' becomes 'press' (I've seen this in another clue).
'ex'+'press'='EXPRESS'
(Other definitions for express that I've seen before include "Explicit" , "Convey in words; train" , "Squeeze out - speak" , "Convey; high-speed" , "Utter - non-stop" .)