He looks just fine (5)
I believe the answer is:
dandy
'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" .)