Small burial chamber containing writing material, book and source of foul smell (5,4)
I believe the answer is:
stink bomb
'source of foul smell' is the definition.
'small burial chamber containing writing material book' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'burial chamber' becomes 'tomb' (I've seen this before).
'containing' means one lot of letters goes inside another.
'writing material' becomes 'ink' (I've seen this before).
'book' becomes 'b'.
'ink'+'b'='inkb'
'tomb' enclosing 'inkb' is 'tinkbomb'.
's'+'tinkbomb'='STINK BOMB'
'and' is the link.
(Other definitions for stink bomb that I've seen before include "Device letting off unpleasant smell when opened - reeking explosive" , "Malodorous pellet" , "Prankster's smelly explosive" , "having been let off in class!" , "Smelly device let off by a schoolboy" .)