Crossword Genius

Problem looking unsolvable ultimately, certainly in need of coach (9)

Ross

I believe the answer is:

eyestrain

I'm a little stuck... Click here to teach me more about this clue!

'problem' is the definition.
(eye problem)

'unsolvable ultimately certainly in need of coach' is the wordplay.
'ultimately' suggests the final letters.
'certainly' becomes 'yes' (both can be used to answer in the affirmative).
'in need of' says to put letters next to each other.
'coach' becomes 'train' (both can mean to instruct a sportsperson).
The last letter of 'unsolvable' is 'e'.
'e'+'yes'+'train'='EYESTRAIN'

'looking' is the link.
I am not very happy about this link. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for eyestrain that I've seen before include "Possible effect of too much reading" , "Stress on mince pies (in the East End)?" , "Difficulty for reader" , "Discomfort of sightseers" , "It might cause pupils problem" .)

I've seen this clue in The Telegraph.
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