13 down
Low
character,
Liberal,
one
probing
British
parliamentarian
(5)
Low character, Liberal, one probing British parliamentarian (5)
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The definition is at the beginning of the clue.
How the clue works
Low character refers to Colonel Blimp, the cartoon creation of David Low. The wordplay puts L (Liberal) and I (one) inside — that's "probing" — B (British), followed by MP (parliamentarian), giving B-LI-MP.