In the middle of feud, tyrant visits invader of continental landmass (7)
I believe the answer is:
eurasia
'invader of continental landmass' is the definition.
'Eurasia' can be an answer for 'landmass' (Eurasia is an example). I'm not certain of the 'invader of continental' bit.
'in the middle of feud tyrant visits' is the wordplay.
'in the middle of' indicates the central letters (I've seen 'in the middle' mean this).
'tyrant visits' becomes 'rasia' (I can't justify this - if you can you should give a lot more credence to this answer).
The central letters of 'feud' are 'eu'.
'eu'+'rasia'='EURASIA'
Can you help me to learn more?
(Other definitions for eurasia that I've seen before include "Continental land mass" , "Huge area" , "Large northern hemisphere land mass" , "large part of world" , "Two continents, considered as a whole" .)