Vulnerabilities certain trade shows must cover (9)
I believe the answer is:
exposures
'vulnerabilities' is the definition.
(exposure is a kind of vulnerability)
'certain trade shows must cover' is the wordplay.
'certain' becomes 'sure' (synonyms).
'trade shows' becomes 'expos' (I've seen this in another clue).
'must cover' indicates putting letters inside.
'sure' placed into 'expos' is 'EXPOSURES'.
(Other definitions for exposures that I've seen before include "Revelations (of scandals, etc)" , "Snaps" .)