They introduce old radio plays (7)

I believe the answer is:

exordia

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'they introduce' is the definition.
The definition suggests an adverb but the answer is not.

'old radio plays' is the wordplay.
'old' becomes 'ex' (prefix meaning former or onetime).
'plays' indicates anagramming the letters.
'radio' with letters rearranged gives 'ordia'.
'ex'+'ordia'='EXORDIA'

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(Other definitions for exordia that I've seen before include "introductory material" , "Introductory parts" , "Introductions" , "Parts of speech" , "Starts to lecture" .)

I've seen this clue in The Independent.

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