Writing in English by experts (5)
I believe the answer is:
prose
'writing' is the definition.
(I've seen this in another clue)
'english by experts' is the wordplay.
'english' becomes 'e' (abbreviation).
'by' means one lot of letters go next to another.
'experts' becomes 'pros' (I've seen this in other clues).
'e' after 'pros' is 'PROSE'.
'in' is the link.
(Other definitions for prose that I've seen before include "Non-verse" , "Literary genre" , "Not poetry" , "Writings not in verse" , "Ordinary writing" .)