Republican leads top-secret rolling review (10)
I believe the answer is:
retrospect
'review' is the definition.
('retrospect' can be a synonym of 'review')
'republican leads top-secret rolling' is the wordplay.
'leads' indicates taking the first letters.
'rolling' is an anagram indicator.
The initial letter of 'republican' is 'r'.
'top'+'secret'='topsecret'
'topsecret' anagrammed gives 'etrospect'.
'r'+'etrospect'='RETROSPECT'
(Other definitions for retrospect that I've seen before include "A backward view" , "Survey of past events" , "Look at history" , "Hindsight" , "review" .)