One politician from a city in America, a beastly type synonymous with the herd mentality (6)
I believe the answer is:
impala
'america a beastly type synonymous with the herd mentality' is the definition.
I can't judge whether this definition defines the answer.
'one politician from a city' is the wordplay.
'one politician' becomes 'imp' (I've seen this in other clues).
'from' says to put letters next to each other.
'city' becomes 'LA' (Los Angeles).
'imp'+'a'+'la'='IMPALA'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for impala that I've seen before include "Graceful antelope" , "Species of African antelope" , "One regularly browsing" , "prodigious bounder" , "leaping creature" .)