Upward trend supplied by speech about current leader (9)
I believe the answer is:
editorial
'current leader' is the definition.
'editorial' can be an answer for 'leader' (type of newspaper article). I am not certain of the 'current' bit.
'upward trend supplied by speech' is the wordplay.
'upward' shows that the letters should be reversed in order (in a down clue, letters go up).
'trend' becomes 'tide' (I've seen this before).
'supplied by' means one lot of letters go next to another.
'speech' becomes 'orial' (I am not sure about this - if you are sure you should believe this answer much more).
'tide' in reverse letter order is 'edit'.
'edit'+'orial'='EDITORIAL'
'about' acts as a link.
Can you help me to learn more?
(Other definitions for editorial that I've seen before include "Newspaper article - "I led a riot" (anag)" , "Article that states a newspaper's opinion" , "Statement of a newspaper's opinion" , "Article expressing the views of the publication" , "matter of opinion" .)