Seize artist entering our land (4)
I believe the answer is:
grab
'seize' is the definition.
(I know that seize can be written as grab)
'artist entering our land' is the wordplay.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'entering' means one lot of letters goes inside another.
'our land' becomes 'gb' (I can't justify this - if you can you should give a lot more credence to this answer).
'ra' going within 'gb' is 'GRAB'.
Can you help me to learn more?
(Other definitions for grab that I've seen before include "Seize roughly" , "Seize rudely" , "Take quickly" , "Catch hold (of)" , "interest" .)