Nominal rolls of leftists? (5)

I believe the answer is:

lists

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'nominal rolls' is the definition.
'lists' can be an answer for 'rolls' (I've seen this in another clue). I am unsure of the 'nominal' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for lists that I've seen before include "field of combat" , "Records" , "Itemises" , "Scene of combat - catalogues" , "Rotas" .)

I've seen this clue in the Evening Standard.

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