Crossword Genius

Can mean trouble, as Billy the Kid was (8)

Ross

I believe the answer is:

nickname

'as billy the kid was' is the definition.
(Billy the Kid was a nickname)

'can mean trouble' is the wordplay.
'can' becomes 'nick' (both can mean a prison).
'trouble' indicates anagramming the letters.
'mean' anagrammed gives 'name'.
'nick'+'name'='NICKNAME'

(Other definitions for nickname that I've seen before include "Friendly appellation by which person is known" , "Jack the Ripper, for example" , "Familiar term of address" , "tag" , "Familiar moniker" .)

I've seen this clue in The Guardian.
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