Speak in old clip (5)
I believe the answer is:
orate
'speak' is the definition.
(I know that orate is a type of speak)
'old clip' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'clip' becomes 'rate' (I've seen this in another clue).
'o'+'rate'='ORATE'
'in' is the link.
(Other definitions for orate that I've seen before include "Lecture" , "Deliver a speech" , "Spout" , "Harangue" , "Make a formal address" .)