Adoration is absent in Solidarity movement (8)
I believe the answer is:
idolatry
'adoration' is the definition.
(I have seen 'Excessive adoration' mean 'idolatry' so perhaps 'adoration' could also mean 'idolatry')
'is absent in solidarity movement' is the wordplay.
'absent in' is a deletion indicator.
'movement' indicates an anagram.
'solidarity' with 'is' removed is 'oldarity'.
'oldarity' with letters rearranged gives 'IDOLATRY'.
(Other definitions for idolatry that I've seen before include "Worship of a false god" , "Getting worked up by image" , "Excessive adoration" , "Hero worship" , "Adulation" .)