One managed to find it on the map (4)
I believe the answer is:
iran
'it on the map' is the definition.
The definition suggests a singular noun which matches the answer.
'one managed' is the wordplay.
'one' becomes 'i' (Roman numeral).
'managed' becomes 'ran' (both can mean organised or was in charge of).
'i'+'ran'='IRAN'
'to find' acts as a link.
Can you help me to learn more?
(Other definitions for iran that I've seen before include "Asian country" , "Modern name for Persia" , "oil supplier" , "Country where the official language is Farsi" , "It was known as Persia until 1935" .)