A role in isolation? (5)

I believe the answer is:

apart

'in isolation?' is the definition.
(I've seen this before)

'a role' is the wordplay.
'role' becomes 'part' (eg a part or role in a film).
'a'+'part'='APART'

(Other definitions for apart that I've seen before include "Unconnected" , "Independently" , "set aside" , "First Christmas present from my love" , "In pieces; separate" .)

I've seen this clue in The Irish News.

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