Raise some unparliamentary correspondence (5)
I believe the answer is:
'correspondence' is the definition.
'raise some unparliamentary' is the wordplay.
'raise' shows that the letters should be reversed in order.
'some' indicates a hidden word (some of the parts of the word are used).
'liame' is hidden in the letters of 'unparliamentary'.
'liame' reversed gives 'EMAIL'.
(Other definitions for email that I've seen before include "Message sent via computer" , "Messages via the internet" , "Internet-borne communication" , "Spam perhaps" , "Electronic communication" .)