Most pointless information on movement (6)
I believe the answer is:
motion
'movement' is the definition.
(I know that movement can be written as motion)
'most pointless information on' is the wordplay.
'most pointless' becomes 'mot' (I can't justify this - if you can you should give a lot more credence to this answer).
'information' becomes 'i' (common abbreviation for information).
'mot'+'i'+'on'='MOTION'
Can you help me to learn more?
(Other definitions for motion that I've seen before include "Old coin of Germany" , "MP's proposal" , "Proposal to be voted on" , "Formal proposal for debate" , "Moving - resolution" .)