Have to enter club nearer to the sea (9)
I believe the answer is:
downriver
'nearer to the sea' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'have to enter club' is the wordplay.
'have' becomes 'own' (to have something is to own it).
'to enter' is an insertion indicator.
'club' becomes 'driver' (type of golf club).
'own' going within 'driver' is 'DOWNRIVER'.
Can you help me to learn more?
(Other definitions for downriver that I've seen before include "going to the coast?" , "From source to mouth" , "over to the sea" , "near mouth of Thames?" .)