Cryptic crossword No 4,155

Across

• 1 acrossBoycott group of stars ultimately switching sides (6)
• 4 acrossPoliceman's element (6)
• 8 acrossA dumber criminal in UK territory (7)
• 9 acrossQuiet cycles flushing new blankets (7)
• 11 acrossContract unchanged after reflection (4)
• 12 acrossBody protection to conceal second lover (5)
• 13 acrossAfter cycling, cook corn grains (4)
• 14 acrossCold work near international plants (5)
• 15 acrossShow what can produce no tip? (5,3)
• 17 acrossFix Times's texts (8)
• 19 acrossSounds leaving one's sense organs (5)
• 21 acrossSaw X censored wound (4)
• 22 acrossHalf-expect playful behaviour (5)
• 23 acrossToo special soup cans (4)
• 25 acrossBinary logically insufficient after disapproving comment (7)
• 26 acrossPart of religious ceremony party not starting (7)
• 27 acrossWise men taking time to make platforms (6)
• 28 acrossIdiot without fixed properties (6)