Get to an open stretch of water (5)
I believe the answer is:
reach
I believe this clue is a double definition.
'get to' is the first definition.
(synonyms)
'an open stretch of water' is the second definition.
(I've seen this before)
(Other definitions for reach that I've seen before include "Be received" , "Come to - stretch of river" , "Arrive at - stretch of river" , "It's an advantage for a boxer" , "bay" .)