Spaniard visits solitary individuals, capitalists (9)

I believe the answer is:

londoners

'capitalists' is the definition.
(people who live in the UK capital)

'spaniard visits solitary individuals' is the wordplay.
'spaniard' becomes 'don'.
'visits' indicates putting letters inside (visit can mean to go into).
'solitary individuals' becomes 'loners'.
'don' going inside 'loners' is 'LONDONERS'.

I've seen this clue in The Telegraph.

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