Crossword Genius

Left one politician with walking difficulty (4)

Ross

I believe the answer is:

limp

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'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" .)

I've seen this clue in The Mirror.
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