Left one politician with walking difficulty (4)
I believe the answer is:
limp
'walking difficulty' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'left one politician' is the wordplay.
'left' becomes 'l' (common abbreviation).
'one' becomes 'i' (Roman numeral).
'politician' becomes 'MP' (Member of Parliament).
'l'+'i'+'mp'='LIMP'
'with' acts as a link.
Can you help me to learn more?
(Other definitions for limp that I've seen before include "Lacking stiffness" , "Wanting stiffness" , "Saggy and drooping" , "Hobble, being slack" , "Flabby - halt" .)