Seeing revolutionary, singular band (7)
I believe the answer is:
genesis
'band' is the definition.
(Genesis are a rock band)
'seeing revolutionary singular' is the wordplay.
'revolutionary' indicates an anagram.
'singular' becomes 's' (abbreviation sometimes used in dictionaries).
'seeing' with letters rearranged gives 'genesi'.
'genesi'+'s'='GENESIS'
(Other definitions for genesis that I've seen before include "Creation" , "Origin -- see sign (anag)" , "name of group" , "Band; book" , "First book of the Old Testament" .)