Stack bordering large field (5)

I believe the answer is:

realm

I'm a little stuck... Click here to teach me more about this clue!

'field' is the definition.
(synonyms)

'stack bordering large' is the wordplay.
'stack' becomes 'ream' (I am not sure about this - if you are sure you should believe this answer much more).
'bordering' is an insertion indicator.
'large' becomes 'L' (eg in clothes sizes).
'ream' enclosing 'l' is 'REALM'.

Can you help me to learn more?

(Other definitions for realm that I've seen before include "World" , "Kingdom, or field of activity" , "King's domain" , "department" , "Province" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.