Mark Lambert, murder victim (5)

I believe the answer is:

label

'mark' is the definition.
(synonyms)

'lambert murder victim' is the wordplay.
'lambert' becomes 'L' (synonyms).
'murder victim' becomes 'abel' (biblical figure murdered by his brother Cain).
'l'+'abel'='LABEL'

(Other definitions for label that I've seen before include "Identifying tag" , "Name-tag" , "Tag or trade name" , "Designate" , "Mark" .)

I've seen this clue in The Sunday Times and The Times.

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