Daily pressure to reap badly (5)
I believe the answer is:
paper
'daily' is the definition.
(newspaper)
'pressure to reap badly' is the wordplay.
'pressure' becomes 'p' (scientific abbreviation).
'badly' indicates anagramming the letters (letters in the wrong order).
'reap' with letters rearranged gives 'aper'.
'p'+'aper'='PAPER'
(Other definitions for paper that I've seen before include "Material made from wood pulp, say" , "It's usually made from wood pulp" , "Journal" , "News publication" , "Daily publication" .)