Revolutionary with others turning up in compound (7)
I believe the answer is:
chelate
'compound' is the definition.
(type of chemical compound)
'revolutionary with others turning up' is the wordplay.
'revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
'with others' becomes 'et al' (short for 'et alia', Latin for 'and others').
'turning up' says the letters should be written in reverse.
'etal' backwards is 'late'.
'che'+'late'='CHELATE'
'in' is the link.
(Other definitions for chelate that I've seen before include "like a crab" , "compound" .)