Left a rupee for the household protector (3)
I believe the answer is:
lar
'the household protector' is the definition.
The definition suggests a singular noun which matches the answer.
'left a rupee' is the wordplay.
'left' becomes 'l' (common abbreviation).
'rupee' becomes 'r'.
'l'+'a'+'r'='LAR'
'for' is the link.
Can you help me to learn more?
(Other definitions for lar that I've seen before include "statue of a god" , "Roman household god" , "Libya" , "What's supposed to protect the house" .)