Like dimensions from former courts (7)
I believe the answer is:
assizes
'former courts' is the definition.
'assizes' can be an answer for 'courts' (I have seen 'Local courts ' mean 'assizes' so perhaps 'courts' could also mean 'assizes'). I am unsure of the 'former' bit.
'like dimensions' is the wordplay.
'like' becomes 'as'.
'dimensions' becomes 'sizes' (I've seen this in another clue).
'as'+'sizes'='ASSIZES'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for assizes that I've seen before include "Local courts" , "Old county courts of England" , "Old county court sessions chaired by itinerant judges" , "Precursor of Crown Courts" , "Judicial sessions (hist.)" .)