Crossword Genius

FM broadcast with time for transitory things (8)

Ross

I believe the answer is:

ephemera

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'transitory things' is the definition.
(I've seen this before)

'fm broadcast with time' is the wordplay.
I cannot really see how this works, but
'time' could be 'era' (I've seen this before) and 'era' is found in the answer.
This may be the basis of clue (or it may be nonsense).

'for' acts as a link.

Can you help me to learn more?

(Other definitions for ephemera that I've seen before include "they'll soon be gone" , "Things that last a very short time" , "Things lasting only briefly" , "Something that lasts or is useful for only a short time" , "They're soon over" .)

I've seen this clue in The Telegraph and The Independent.
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