Managed to find henchman in old port (7)
I believe the answer is:
rangoon
'old port' is the definition.
'rangoon' can be an answer for 'port' (I've seen this before). I'm unsure of the 'old' bit.
'managed to find henchman' is the wordplay.
'managed' becomes 'ran' (I've seen this in another clue).
'to find' is a charade indicator (letters next to each other).
'henchman' becomes 'go on' (goon can mean a henchman or accomplice).
'ran'+'goon'='RANGOON'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for rangoon that I've seen before include "Former Burmese capital" , "Asian capital" , "Port and largest city of Burma" , "It's now Yangon in Myanmar" , "Former capital of Burma" .)