Large region in Matsuida oddly ignored (4)
I believe the answer is:
asia
'large region' is the definition.
'asia' can be an answer for 'region' (I have seen 'populous region' mean 'asia' so perhaps 'region' could also mean 'asia'). I am not certain of the 'large' bit.
'matsuida oddly ignored' is the wordplay.
'oddly ignored' means one should take alternating letters (letters in odd-numbered positions removed).
The alternate letters of 'matsuida' are 'ASIA'.
'in' is the link.
Can you help me to learn more?
(Other definitions for asia that I've seen before include "populous region" , "A vast number of people have lived here" , "group of countries" , "It has most of the earth's population" , "Tigers found here" .)