Save man on board threatened by mate that's crazy (7)
I believe the answer is:
barking
'board threatened by mate that's crazy' is the definition.
I can't judge whether this defines the answer.
'save man on' is the wordplay.
'save' becomes 'bar' (I've seen this before).
'man' becomes 'king' (man can mean a chess piece).
'on' means one lot of letters go next to another.
'bar'+'king'='BARKING'
Can you help me to learn more?
(Other definitions for barking that I've seen before include "Mad - town forming a London borough with Dagenham" , "Mental" , "Dog may be" , "up the pole" , "Crazy - yapping" .)