Dismisses as "Just platforms for politicians" (6)
I believe the answer is:
stumps
'dismisses' is the definition.
Although both the answer and definition are verbs in their -s form, I don't see how they can define each other.
'just platforms for politicians' is the wordplay.
'just platforms for' becomes 'stu' (I can't explain this - if you can you should give a lot more credence to this answer).
'politicians' becomes 'MPs' (Members of Parliament).
'stu'+'mps'='STUMPS'
'as' is the link.
Can you help me to learn more?
(Other definitions for stumps that I've seen before include "is completely perplexing" , "Baffles on the cricket pitch" , "in match, finally drawn" , "bits that are left" , "Cricket posts" .)