First hole (7)
I believe the answer is:
opening
This clue is a double definition.
'first' is the first definition.
(similar in meaning)
'hole' is the second definition.
(I've seen this before)
(Other definitions for opening that I've seen before include "Vacancy" , "Orifice; opportunity" , "launch" , "Inauguration" , "Yawning" .)