Boy seen in Welsh port (5)
I believe the answer is:
barry
This clue could be a double definition.
'boy' is the first definition.
'welsh port' is the second definition.
The definition suggests an adjective which matches the answer.
'seen in' acts as a link.
Can you help me to learn more?
(Other definitions for barry that I've seen before include "-- Island, Welsh resort" , "South Wales town -- boy's name" .)