Duplicates

3 clues
Ringers
Identical sets
What the 10 longest answers (including this one) all lack
Similar answers:
Abdicates
Adjudicates
Advocates
Allocates
Bifurcates
Cates
Cellduplication
Certificatesofdeposit
Dedicates
Delicates
Delicatessen
Delicatessenman
Demarcates
Deprecates
Devilsadvocates
Dislocates
Duplicate
Duplicatebridge
Duplicatekey
Duplicatekeys