Rastafarian finally returns Nigerian cash (5)
I believe the answer is:
naira
'cash' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'rastafarian finally returns nigerian' is the wordplay.
'finally' suggests the final letters.
'returns' says the letters should be written backwards.
'nigerian' becomes 'aria' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The last letter of 'rastafarian' is 'n'.
'aria' reversed gives 'aira'.
'n'+'aira'='NAIRA'
Can you help me to learn more?
(Other definitions for naira that I've seen before include "African means" , "foreign exchange" , "African rhino" , "piece of Nigerian money" , "African settler" .)