Shareholders' meeting about opening in Europe is revealing prejudice (6)
I believe the answer is:
ageism
'prejudice' is the definition.
(prejudice against older people)
'shareholders' meeting about opening in europe is' is the wordplay.
'shareholders' meeting' becomes 'agm' (abbreviation for annual general meeting).
'about' is an insertion indicator.
'opening in' says to take the initial letters.
The first letter of 'europe' is 'e'.
'e'+'is'='eis'
'agm' placed around 'eis' is 'AGEISM'.
'revealing' acts as a link.
(Other definitions for ageism that I've seen before include "Discrimination on the basis of longevity" , "Images about prejudice against old people" , "Prejudice on grounds of advanced years" , "Discrimination against the elderly" , "Resentment of the more experienced" .)