Legislator with support in UN? Quite a lot (7)
I believe the answer is:
umpteen
'quite a lot' is the definition.
I can't tell whether this definition defines the answer.
'legislator with support in un?' is the wordplay.
'legislator' becomes 'mp' (an MP legislates in parliament).
'with' means one lot of letters go next to another.
'support' becomes 'tee' (tee is a kind of support).
'in' is an insertion indicator.
'mp'+'tee'='mptee'
'mptee' placed inside 'un' is 'UMPTEEN'.
Can you help me to learn more?
(Other definitions for umpteen that I've seen before include "Plentiful" , "Pet menu for a great many" , "An uncountable number" , "Numerous" , "Lots of things on pet menu" .)