Tiredness in sense organ requires one to go in ten years after treatment (9)
I believe the answer is:
eyestrain
'tiredness in sense organ' is the definition.
'eyestrain' can be an answer for 'tiredness' (eyestrain is a kind of tiredness). I am not sure about the 'in sense organ' bit.
'one to go in ten years after treatment' is the wordplay.
'one' becomes 'i' (Roman numeral).
'to go in' indicates putting letters inside.
'after treatment' indicates an anagram (letters treated or processed in a new way).
'ten'+'years'='tenyears'
'tenyears' anagrammed gives 'eyestran'.
'i' going within 'eyestran' is 'EYESTRAIN'.
'requires' is the link.
Can you help me to learn more?
(Other definitions for eyestrain that I've seen before include "complaint" , "Discomfort of sightseers" , "pupils are involved in such trouble" , "Possible effect of too much reading" , "A serenity leading to ocular stress" .)