Crossword Genius

Problem of retina? Yes, possibly (9)

Ross

I believe the answer is:

eyestrain

'problem' is the definition.
(eye problem)

'retina? yes possibly' is the wordplay.
'possibly' indicates an anagram.
'retina'+'yes'='retinayes'
'retinayes' is an anagram of 'EYESTRAIN'.

'of' is the link.

(Other definitions for eyestrain that I've seen before include "Ocular tiredness" , "this could require attention from ophthalmologist" , "which makes it hard to see" , "Difficulty for reader" , "Reader's issue" .)

I've seen this clue in The Telegraph.
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