Criminal figure at London museum (6)
I believe the answer is:
vandal
'criminal' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?
'figure at london museum' is the wordplay.
'figure' becomes 'l' (I've seen this in other clues).
'at' means one lot of letters go next to another (I've seen this in other clues).
'london museum' becomes 'vanda' (V and A, Victoria and Albert Museum).
'l' put after 'vanda' is 'VANDAL'.
Can you help me to learn more?
(Other definitions for vandal that I've seen before include "One doing deliberate damage" , "Destructive person" , "Lout causing damage to property" , "One who wilfully defaces or destroys property" , "Wanton wrecker" .)