It may well offer light relief (6)

I believe the answer is:

window

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

'light relief' is the definition.
'window' can be an answer for 'light' (light can mean a window or opening). I'm not sure about the 'relief' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for window that I've seen before include "Glazed opening" , "Shop display area" , "Eg, oriel or fanlight" , "Opening to admit light" , "See 1 down" .)

I've seen this clue in The Irish News.

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