Possible Clues:

• Even if it turns sad, by the sound of it, one may make light of it
• If it turns so sad as 33 across, one may make light of it
• If it turns sad, by the sound of it, one gets a glow from it
• Thin thread (e.g. in bulb)
• If one turns sad, one may get bright
• Even if it turns sad, you make light of it
• Even if it turns sad, it may get bright
• If it turns with a sad sound,this will make light of it
• Even if it turns sad, you may make light of it
• If it turns sad, by the sound of it, it glows