Green’s Dictionary of Slang

deener n.

also deana, deaner, deano, deena, deenir, deiner, denar, denare, denari, denarly, dener, diener, dienner
[Ital. dinero, ult. f. Lat. denarius]

1. [mid-19C+] (orig. Ling. Fr./Polari; later Aus./N.Z.) one shilling (5p), money in general.

2. attrib. use of sense 1.

3. [1950s+] (US) ten cents.