See about a fellow entering the legislature (6)
I believe the answer is:
senate
'legislature' is the definition.
(senate is a kind of legislature)
'see about a fellow entering' is the wordplay.
'about' says the letters should be written backwards.
'a fellow' becomes 'tan' (I can't justify this - if you can you should give a lot more credence to this answer).
'entering' indicates putting letters inside.
'tan' reversed gives 'nat'.
'see' enclosing 'nat' is 'SENATE'.
'the' acts as a link.
Can you help me to learn more?
(Other definitions for senate that I've seen before include "Second house of Government" , "The upper house in parliament or oireachtas" , "Governing body of ancient Rome" , "Legislative assembly" , "State assembly" .)