Edifice playfully termed a centre for crooks! (6)
I believe the answer is:
castle
'edifice playfully' is the definition.
I can't judge whether this definition defines the answer.
'termed a centre for crooks' is the wordplay.
'termed' becomes 'ca' (I can't justify this - if you can you should believe this answer much more).
'a centre for' means to look at the middle letters.
'crooks' becomes 'rustlers' (rustler is a kind of crook).
The central letters of 'rustlers' are 'stle'.
'ca'+'stle'='CASTLE'
Can you help me to learn more?
(Other definitions for castle that I've seen before include "old building?" , "a piece in the corner" , "Move rook and king in the same turn" , "Left's Social Services secretary" , "Stronghold - chessman" .)