Liberal aimed to join new leader in constituency (10)
I believe the answer is:
maidenhead
'constituency' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'liberal aimed to join new leader' is the wordplay.
'liberal' is an anagram indicator.
'to join' means one lot of letters go next to another.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'leader' becomes 'head' (head is a kind of leader).
'aimed' with letters rearranged gives 'maide'.
'maide'+'n'+'head'='MAIDENHEAD'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for maidenhead that I've seen before include "town on the Thames" , "Place" .)