Crossword Genius

Mild union in need of working capital, historically (9)

Ross

I believe the answer is:

londinium

'capital historically' is the definition.
(London in Roman times)

'mild union in need of working' is the wordplay.
'in need of working' indicates an anagram.
'mild'+'union'='mildunion'
'mildunion' with letters rearranged gives 'LONDINIUM'.

(Another definition for londinium that I've seen is " Roman city on the Thames".)

I've seen this clue in The Times.
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