Possible Clues:

• … a little of it fills Porkie's figure
• For example: less than honest statements about drink that isn't large?
• Literary understatement such as "not unhappy"
• It's no exaggeration to say that one lighted on one's broken toes
• Is prone, possibly, to accept child's understatement
• Say! Not bad for excellent line one carries
• T.S. Eliot's randomly assigned figure of speech
• Understatement used for effect by T.S. Eliot?
• Figure no mature person prevaricates about
• Building is to let - that's an understatement