Outlaw what muggers may do to conceal themselves? (5,4)

I believe the answer is:

robin hood

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This might be a double definition.

'outlaw' is the first definition.
(Robin Hood is an example)

'what muggers may do to conceal themselves?' is the second definition.
The definition suggests a singular noun which matches the answer.

Can you help me to learn more?

(Other definitions for robin hood that I've seen before include "Sherwood outlaw" , "Legendary outlaw of English folklore" , "Rich robber, poor payer!" , "Famous outlaw" , "Lawbreaker" .)

I've seen this clue in The Times.

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