Like some cereal consumed in borders of Oman? (5)
I believe the answer is:
oaten
'like some cereal' is the definition.
(I've seen this in another clue)
'consumed in borders of oman?' is the wordplay.
'consumed' becomes 'ate' (to eat is to consume food).
'in' means one lot of letters goes inside another.
'borders of' means to remove the middle letters.
'oman' with its middle removed is 'on'.
'ate' placed inside 'on' is 'OATEN'.
(Other definitions for oaten that I've seen before include "Like some cereal" , "of cereals" , "Made of a cereal" , "like porridge" .)