One politician is cheeky little fellow (3)
I believe the answer is:
imp
'cheeky little fellow' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'one politician' is the wordplay.
'one' becomes 'i' (Roman numeral).
'politician' becomes 'MP' (Member of Parliament).
'i'+'mp'='IMP'
'is' is the link.
Can you help me to learn more?
(Other definitions for imp that I've seen before include "A small mischievous devil" , "Rascal" , "old graft" , "Mischievous child" , "Scallywag" .)