Sense some having a row must welcome agreement (8)
I believe the answer is:
eyesight
'sense' is the definition.
(sight is a sense)
'some having a row must welcome agreement' is the wordplay.
'some having a row' becomes 'eight' (I can't explain this - if you can you should believe this answer much more).
'must welcome' means one lot of letters goes inside another.
'agreement' becomes 'yes' (saying yes to something).
'eight' going around 'yes' is 'EYESIGHT'.
Can you help me to learn more?
(Other definitions for eyesight that I've seen before include "perception" , "Purpose of certain organs" , "Requirement to look" , "Faculty of vision" , "Showing sense" .)