One who invests in The Guardian ? (5)
I believe the answer is:
angel
This clue could be a double definition.
'one who invests' is the first definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'guardian ?' is the second definition.
(I've seen this before)
'in the' is the link.
Can you help me to learn more?
(Other definitions for angel that I've seen before include "Top D [DECORATION]" , "Cloud resident?" , "One usually obliging" , "Guardian spirit; theatre investor" , "One backing theatre production" .)