Possible Clues:

• Shriek going to church, avoiding a traipse in mud, by the sound of it
• Sound of boot in mud
• In school, pupil's leaving to suppress gurgling sound
• Following work, lacking first sign of energy, child's put down
• Sneak before church avoiding a crush
• Gurgling noise to suppress almost completely during school
• Sound of muddy walk
• Sound of boots in mud
• Suppress background noise when playing squash
• Sound of walking in mud