Imagine getting the paper for just one old penny! (5)
I believe the answer is:
dream
'imagine' is the definition.
(dreaming is a kind of imagining)
'the paper for just one old penny' is the wordplay.
'the paper' becomes 'ream' (I've seen this before).
'for' says to put letters next to each other (I've seen this in other clues).
'just one old penny' becomes 'd' (I can't justify this - if you can you should believe this answer much more).
'ream' put after 'd' is 'DREAM'.
'getting' acts as a link.
Can you help me to learn more?
(Other definitions for dream that I've seen before include "Sleeping thoughts" , "Switch off" , "Night-time fantasy" , "Somniate" , "Cherished hope; fantasy" .)