Sense agreement in the crew (8)
I believe the answer is:
eyesight
'sense' is the definition.
(eyesight is a kind of sense)
'agreement in the crew' is the wordplay.
'agreement' becomes 'yes'.
'in the' indicates putting letters inside.
'crew' becomes 'eight' (I've seen this before).
'yes' put inside 'eight' is 'EYESIGHT'.
(Other definitions for eyesight that I've seen before include "Purpose of certain organs" , "Seeing faculty" , "Yes, eight required for vision" , "Visual faculty" , "View" .)