View certainly restricted by rowers (8)
I believe the answer is:
eyesight
'view' is the definition.
(I've seen this before)
'certainly restricted by rowers' is the wordplay.
'certainly' becomes 'yes' (I've seen this before).
'restricted by' indicates putting letters inside (I've seen this in other clues).
'rowers' becomes 'eight' (I've seen this before).
'yes' inserted into 'eight' is 'EYESIGHT'.
(Other definitions for eyesight that I've seen before include "Yes, eight required for vision" , "Power of seeing" , "perception" , "Ability to see" , "What's needed to see" .)