Ridicule a boring liberal politician with nothing on (7)
I believe the answer is:
lampoon
'ridicule' is the definition.
(lampooning is a kind of ridiculing)
'a boring liberal politician with nothing on' is the wordplay.
'boring' is an insertion indicator (some letters must 'bore' a hole into other letters).
'liberal' becomes 'l' (abbreviation).
'politician' becomes 'MP' (Member of Parliament).
'with' means one lot of letters go next to another.
'nothing' becomes 'O' (looks like zero - 0).
'l'+'mp'='lmp'
'a' placed within 'lmp' is 'lamp'.
'lamp'+'o'+'on'='LAMPOON'
(Other definitions for lampoon that I've seen before include "ridiculous scenario" , "Literary satire" , "Written ridicule of polo man" , "Mock" , "Pool man (anag)" .)