Possible Clues:

• Made numb
• Numbed
• Soundproofed
• Exploit in port had a numbing effect
• Numbed, as pain
• Numbed by a fair amount of those from 26 across finding energy in finish
• Made soundproof
• Energy during stalemate subdued
• English, in cul-de-sac, subdued
• Numbed 25 across with a fair amount of weed