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Any help appreciated.
15dn Something that passes quickly, fashionable update(8)
?u??????

fugitive

fugitive: quick to disappear; fleeting.
"the fugitive effects of light"
synonyms: transient, transitory, ephemeral, evanescent, flitting, flying, fading, momentary, short-lived, short, brief, passing, impermanent, fly-by-night, here today and gone tomorrow;

Jazzy, thanks for shedding some light on the subject!

;-)

I've come across the term applied to pigments - see http://en.wikipedia.org/wiki/Fugitive_pigment

Hair today and Goon tomorrow !

;)

Many thanks for all help.

I have bulletin for 15d which definitely fits in with the across clues rather than fugitive.
Bullet for something that passes quickly, in for fashionable, giving bulletin for update.