Imagine head of drama getting a lot of paper (5)
I believe the answer is:
dream
'imagine' is the definition.
(dreaming is a kind of imagining)
'head of drama getting a lot of paper' is the wordplay.
'head of' suggests taking the first letters.
'getting' is a charade indicator (letters next to each other).
'a lot of paper' becomes 'ream' (I've seen this in another clue).
The first letter of 'drama' is 'd'.
'd'+'ream'='DREAM'
(Other definitions for dream that I've seen before include "Cherished hope or ideal" , "Vision - very pleasant person" , "person to good to be true" , "Sleeping thoughts" , "dozy state" .)