A boring couple (5)
I believe the answer is:
brace
This clue might be a double definition.
'a boring' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'couple' is the second definition.
(brace can mean a pair of something)
Can you help me to learn more?
(Other definitions for brace that I've seen before include "Steady; pair" , "Two - supporter" , "Secure" , "Pair; hand drill" , "Pair of game-birds" .)