A pound could be a good investment (3)
I believe the answer is:
alb
'be a good investment' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'a pound' is the wordplay.
'pound' becomes 'lb' (abbreviation for the unit of weight).
'a'+'lb'='ALB'
'could' is the link.
Can you help me to learn more?
(Other definitions for alb that I've seen before include "clerical belongings" , "White linen liturgical vestment" , "Priestly garment" , "Clerical gown" , "Clerical vestment." .)