Specialists expressed in plain language (5)
I believe the answer is:
prose
'plain language' is the definition.
(I've seen this in other clues)
'specialists expressed' is the wordplay.
'specialists' becomes 'pros' (I've seen this in another clue).
'expressed' shows a homophone (sound like).
'pros' sounds like 'PROSE'.
'in' acts as a link.
(Other definitions for prose that I've seen before include "Gossipy talker" , "Writings not in verse" , "Not poetry" , "Normal written language" , "Ropes (anag.)" .)