Prince Albert killed in accordance with law (5)

I believe the answer is:

halal

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'killed in accordance with law' is the definition.
I can't judge whether this definition defines the answer.

'prince albert' is the wordplay.
'prince' becomes 'hal' (Shakespearean nickname of Henry V when a prince).
'albert' becomes 'al'.
'hal'+'al'='HALAL'

Can you help me to learn more?

(Other definitions for halal that I've seen before include "Conforming to Islamic (dietary) laws" , "special sort of meat" , "Meat slaughtered in accordance with Islamic law" , "which food is legal in Mecca" , "specially-prepared meat" .)

I've seen this clue in The Times.

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