Crazy man will make concise container (8)
I believe the answer is:
nutshell
'concise container' is the definition.
(I've seen this before)
'crazy man will' is the wordplay.
'crazy' becomes 'nuts' (I've seen this before).
'man' becomes 'he'.
'will' becomes 'll'.
'nuts'+'he'+'ll'='NUTSHELL'
'make' acts as a link.
(Other definitions for nutshell that I've seen before include "Fruit's woody covering" , "One on almond" , "Concise container" , "It holds the kernel (or summary?)" , "Briefly, in one of these" .)