Leading doctors envisage large health investment for city (5)

I believe the answer is:

delhi

'for city' is the definition.
(Delhi is an example)

'leading doctors envisage large health investment' is the wordplay.
'leading' says to take the initial letters (the leading letter of the word).
The initial letters of 'doctors envisage large health investment' is 'DELHI'.

(Other definitions for delhi that I've seen before include "Indian capital city" , "Capital at one time" , "Plumbing ring" , "Indian state" , "New -, Asian capital" .)

I've seen this clue in The Guardian.

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