Short form of summary (5)
I believe the answer is:
recap
'form of summary' is the definition.
(I know that recap is a type of capitulation)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for recap that I've seen before include "cover the same ground again" , "Quickly run through" , "Summarise briefly (abbr)" , "Run through again (Inf)" , "play again" .)