He looks just fine (5)

I believe the answer is:

dandy

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

'fine' is the definition.
(I've seen this before)

'he looks just' is the wordplay.
'he' becomes 'Dan'.
'looks just' becomes 'dy' (I can't justify this - if you can you should give a lot more credence to this answer).
'dan'+'dy'='DANDY'

Can you help me to learn more?

(Other definitions for dandy that I've seen before include "Beau" , "Man about town" , "Stylish dresser" , "Marathon running strips" , "See 6" .)

I've seen this clue in the Evening Standard.

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