Where most of America was involved in war? (6)
I believe the answer is:
crimea
'involved in war?' is the definition.
'crimea' can be an answer for 'war?' (I've seen this before). I'm not sure about the 'involved in' bit.
'where most of america' is the wordplay.
'where' indicates an anagram (I've seen this in other clues).
'most of' means to remove the last letter.
'america' with its last letter removed is 'americ'.
'americ' is an anagram of 'CRIMEA'.
'was' is the link.
Can you help me to learn more?
(Other definitions for crimea that I've seen before include "Where there was a battle" , "former battleground" , "'Ukrainian peninsula, site of a 19th-century war (6)'" , "former war site" , "Area of Ukraine" .)