Originated something briefly fashionable therein? (8)
I believe the answer is:
fathered
'originated' is the definition.
Although both the answer and definition are past participle verbs, I don't see how one could define the other.
'something briefly fashionable therein?' is the wordplay.
I cannot really see how this works, but
'something' could be 'er' (I've seen this in other clues) and 'er' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
I've seen this clue in the Evening Standard.
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