10 across
Colourful
band
from
special
city
snubbed
president
(8)
Colourful band from special city snubbed president (8)
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The definition is at the beginning of the clue.
How the clue works
The definition is Colourful band, meaning a spectrum of colours. It is built as a charade: SP (special) + EC (the City of London postcode) + TRUM, which is TRUMP (president) with its last letter snubbed off, giving SPECTRUM.