Posh politician held by detective throws down (5)
I believe the answer is:
dumps
'throws down' is the definition.
The definition and answer can be both to do with motion as well as being verbs in their -s form.
Maybe you can see a link between them that I don't see?
'posh politician held by detective' is the wordplay.
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-U).
'politician' becomes 'MP' (Member of Parliament).
'held by' means one lot of letters goes inside another.
'detective' becomes 'DS' (detective sergeant).
'u'+'mp'='ump'
'ump' inserted into 'ds' is 'DUMPS'.
Can you help me to learn more?
(Other definitions for dumps that I've seen before include "Rubbish tips" , "Low spirits" , "Ends relationship" , "One can be down in them" , "Ditches" .)