Recall a leading Russian religious adherent (5)
I believe the answer is:
rasta
'religious adherent' is the definition.
(I've seen this before)
'recall a leading russian' is the wordplay.
'recall' is a reversal indicator (I've seen 'recalled' mean this).
'leading russian' becomes 'tsar'.
'a'+'tsar'='atsar'
'atsar' written backwards gives 'RASTA'.
(Other definitions for rasta that I've seen before include "Religious adherent" , "Member of religious group" , "religious follower" , "Believer with dreadlocks" , "worshipper from Jamaica" .)