Create a diversion in harbour (9)
I believe the answer is:
entertain
'harbour' is the definition.
(synonyms)
'create a diversion in' is the wordplay.
I cannot really understand how this works, but
'a' is present in the answer.
'in' 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 entertain that I've seen before include "Act as host" , "harbour" , "Think about" , "Show hospitality to; amuse" , "Put up" .)