Vote loser disturbed former US president (9)

I believe the answer is:

roosevelt

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'former us president' is the definition.
'roosevelt' can be an answer for 'president' (Roosevelt is an example). I'm unsure of the 'former us' bit.

'vote loser disturbed' is the wordplay.
'disturbed' indicates an anagram.
'vote'+'loser'='voteloser'
'voteloser' anagrammed gives 'ROOSEVELT'.

Can you help me to learn more?

(Other definitions for roosevelt that I've seen before include "32nd US president, Franklin" , "Surname of 26th and 32nd US presidents" , "See president" , "Old president" , "former president" .)

I've seen this clue in The Telegraph.

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