Army engineer in lawsuit that can be ironed out (6)
I believe the answer is:
crease
'ironed out' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'army engineer in lawsuit' is the wordplay.
'army engineer' becomes 'RE' (short for Royal Engineer).
'in' means one lot of letters goes inside another.
'lawsuit' becomes 'case' (a legal case).
're' placed into 'case' is 'CREASE'.
'that can be' is the link.
Can you help me to learn more?
(Other definitions for crease that I've seen before include "Line on a cricket pitch" , "Line produced by folding" , "Furrow, wrinkle" , "Wrinkle or pressed line" , "found on cricket pitch" .)