Body part discovered in Pimlico, London (5)
I believe the answer is:
colon
'body part' is the definition.
(colon is a kind of body part)
'discovered in pimlico london' is the wordplay.
'discovered' indicates the answer is hidden within the clue (remove the letters covering the answer in the clue).
'COLON' is hidden within 'in pimlico london'.
(Other definitions for colon that I've seen before include "Part of body; two dots" , "Stop - part of intestine" , "cash" , "City at the Caribbean entrance to the Panama Canal" , "Punctuation mark; gut" .)