Lectures from courses about a king from the east (7)
I believe the answer is:
tirades
'lectures' is the definition.
(a tirade is an angry rant or lecture)
'courses about a king from the east' is the wordplay.
'courses' becomes 'tides' (tiding is a kind of coursing).
'about' indicates putting letters inside.
'king' becomes 'R' (abbreviation of Latin rex).
'from the east' is a reversal indicator (on a map from right to left).
'a'+'r'='ar'
'ar' written backwards gives 'ra'.
'tides' going around 'ra' is 'TIRADES'.
'from' acts as a link.
(Other definitions for tirades that I've seen before include "It dares to unleash long angry speeches" , "torrents of abuse" , "Speeches of violent denunciation" , "Astride (anag) - diatribes" , "Rants" .)