This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Simple past tense and past participle of clamp.

"His expression clamped into formidable austerity, then relaxed."

clamped    clamping    clamps   

fix    secure    fasten    bring down    inflict    visit    impose   

pedicle clamp    test-tube clamp    molders' clamp    collar and clamp    binding-screw clamp    geometrical clamp    horseshoe clamp    clasp    vice    vise   

clam   

clamped    clamping    nipple clamp    clover clamp    clamp down   

tramp    clump    clam    cramp    gripe    vise    cramp iron    horse    dog    yoke   

Camp    Champ    amp    camp    champ    cramp    damp    decamp    encamp    gamp   

screw    latch    bolt    plug    lever    pin    bracket    lug    fitting    fastener