So-called reassessment on Milan (7)

I believe the answer is:

nominal

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'so-called' is the definition.
(I've seen this before)

'reassessment on milan' is the wordplay.
'on milan' can be anagrammed to 'NOMINAL'.
However, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for nominal that I've seen before include "Ostensible" , "In name or form only" , "unreal" , "trifling" , "Existing in name only" .)

I've seen this clue in The Mirror.

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