Serviceman captures a foul-mouthed nationalist (9)
I believe the answer is:
garibaldi
'nationalist' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see an association between them that I don't see?
'serviceman captures a foul-mouthed' is the wordplay.
'serviceman' becomes 'gi' (informal term for a US soldier).
'captures' means one lot of letters goes inside another.
'foul-mouthed' becomes 'ribald' (I've seen this before).
'a'+'ribald'='aribald'
'gi' enclosing 'aribald' is 'GARIBALDI'.
Can you help me to learn more?
(Other definitions for garibaldi that I've seen before include "Currant sandwich biscuit" , "military commander" , "leader of nationalists" , "Italian leader; biscuit" , "Lady's blouse" .)