Crossword Genius

Seem unhappy to be a source of illumination? (6)

Ross

I believe the answer is:

glower

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'a source of illumination?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'seem unhappy' is the wordplay.
'seem' becomes 'glow' (glowing is a kind of seeming).
'unhappy' becomes 'er' (I can't explain this - if you can you should believe this answer much more).
'glow'+'er'='GLOWER'

'to be' acts as a link.

Can you help me to learn more?

(Other definitions for glower that I've seen before include "Look black" , "firefly?" , "Glare" , "burning ember, say?" , "Frown" .)

I've seen this clue in the Evening Standard.
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