Purposeless, disorganised raid on newspaper (6)
I believe the answer is:
adrift
'purposeless' is the definition.
(similar in meaning)
'disorganised raid on newspaper' is the wordplay.
'disorganised' is an anagram indicator.
'on' says to put letters next to each other.
'newspaper' becomes 'FT' (Financial Times newspaper).
'raid' with letters rearranged gives 'adri'.
'adri'+'ft'='ADRIFT'
(Other definitions for adrift that I've seen before include "Aimlessly floating" , "(Of ship) out of control" , "not settled" , "Floating uncontrolled" , "Moving aimlessly, unfastened" .)