A new job, but doesn't finish mature port (9)
I believe the answer is:
anchorage
'port' is the definition.
(I've seen this before)
'a new job but doesn't finish mature' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is present in the answer.
'mature' could be 'age' (synonyms) and 'age' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for anchorage that I've seen before include "road" , "where you might fnd a refuge" , "American city" , "place to moor vessel" , "Roadstead" .)