MP, possibly a Brit, called more corrupt ... (7,8)

I believe the answer is:

liberal democrat

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'mp' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'a brit called more corrupt' is the wordplay.
'corrupt' indicates an anagram.
'a'+'brit'+'called'+'more'='abritcalledmore'
'abritcalledmore' anagrammed gives 'LIBERAL DEMOCRAT'.

'possibly' acts as a link.

Can you help me to learn more?

(Other definitions for liberal democrat that I've seen before include "Politician" , "Party member" , "party person" , "Cable, say" .)

I've seen this clue in The Telegraph.

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