Viewer's irritation after year in set production (9)
I believe the answer is:
eyestrain
'viewer's irritation' is the definition.
'eyestrain' can be an answer for 'irritation' (irritation in the eyes). I'm not certain of the 'viewer's' bit.
'year in set production' is the wordplay.
'production' indicates anagramming the letters.
'year'+'in'+'set'='yearinset'
'yearinset' with letters rearranged gives 'EYESTRAIN'.
'after' acts as a link.
Can you help me to learn more?
(Other definitions for eyestrain that I've seen before include "It might cause pupils problem" , "Reader's problem" , "puts pressure on pupils" , "Tension on the visual organ" , "Discomfort of sightseers" .)