Pure conversion to English money (5)
I believe the answer is:
rupee
'money' is the definition.
(currency of India)
'pure conversion to english' is the wordplay.
'conversion' indicates an anagram.
'to english' becomes 'e' (abbreviation).
'pure' is an anagram of 'rupe'.
'rupe'+'e'='RUPEE'
(Other definitions for rupee that I've seen before include "Indian currency unit" , "available without capital holds up" , "Indian bread" , "foreign currency" , "little money abroad" .)