Pressure to clear out bundle (6)
I believe the answer is:
parcel
'bundle' is the definition.
(I know that bundle can be written as parcel)
'pressure to clear out' is the wordplay.
'pressure' becomes 'p' (scientific abbreviation).
'to' means one lot of letters go next to another.
'out' indicates an anagram (out can mean wrong or inaccurate).
'clear' with letters rearranged gives 'arcel'.
'p'+'arcel'='PARCEL'
(Other definitions for parcel that I've seen before include "Consignment of wrapped items" , "Package wrapped in paper" , "One wrapped" , "Packet" , "Something wrapped up in package, as for posting" .)