Publicity from trade fair guaranteed (8)
I believe the answer is:
exposure
'publicity' is the definition.
(I've seen this before)
'trade fair guaranteed' is the wordplay.
'trade fair' becomes 'expo' (I've seen this before).
'guaranteed' becomes 'sure' (I've seen this in another clue).
'expo'+'sure'='EXPOSURE'
'from' is the link.
(Other definitions for exposure that I've seen before include "Laying open to public view" , "Disclosure - made by a photographer?" , "that is brought to light?" , "Lack of cover" , "Disclosure (by camera?)" .)