Hard to invest in bank for legislative assembly (7)
I believe the answer is:
chamber
'assembly' is the definition.
(I know that chamber is a type of assembly)
'hard to invest in bank for legislative' is the wordplay.
I cannot really see how this works, but
'hard' could be 'h' (abbreviation used in pencil classifications) and 'h' is located in the answer.
'bank' could be 'camber' (synonyms) and 'camber' is found within the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for chamber that I've seen before include "vault" , "Judge's room" , "Room for the judge or the bed" , "Compartment" , "Room - part of a legislature" .)