Facts are in vogue for the last part (3,3)

I believe the answer is:

fag end

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'last part' is the definition.
'fag end' can be an answer for 'part' (fag end is a kind of part). I'm not certain of the 'last' bit.

'facts are in vogue' is the wordplay.
'facts' becomes 'gen'.
'are in' indicates putting letters inside.
'vogue' becomes 'fad' (fad is a kind of vogue).
'gen' put inside 'fad' is 'FAG-END'.

'for the' acts as a link.

Can you help me to learn more?

(Other definitions for fag end that I've seen before include "Useless bit" , "Cigarette butt, the last part" , "Smoker's butt" , "Last insignificant bit" , "Butt - something picked up out of context" .)

I've seen this clue in The Daily Express.

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