Possible Clues:

• Guerrilla leader, flipping genuine smile!
• ''Don't look so glum!''
• 'Things aren't that bad'
• Encouraging words
• Recover humour
• Get happy, lose the blues
• Come out of the blue?
• Become less miserable
• Stop moping around with revolutionary in hospital out of bed
• Comfort: heating creamed vegetables, maybe, in retirement