Outer Mongolia supports Forster or Austen novel (4)
I believe the answer is:
emma
'austen novel' is the definition.
(novel by Jane Austen)
'outer mongolia supports forster' is the wordplay.
'outer' says to hollow out the word (remove centre letters).
'supports' says to put letters next to each other (bottom letters provide a support for the top ones).
'forster' becomes 'em' (I've seen this in other clues).
'mongolia' with its middle removed is 'ma'.
'ma' after 'em' is 'EMMA'.
'or' acts as a link.
(Other definitions for emma that I've seen before include "Best Actress Oscar winner 1992, for 'Howard's End'" , "Jane Austen work - Ms Bunton, former Baby Spice" , "companion for Pip" , "classic work" , "Female" .)