Second

21 clues
Abet
Moment
Placed
Support
Back up
Instant
Time unit
Assistant
Base place
Brief time
Clock hand
Unsurpassed
Minute part
Kind of hand
Unit of Time
Kind of fiddle
Moment in time
Place in a race
Boxer's attendant
Corner of a diamond
Support for a motion
Similar answers:
1sec
Aaabonds
Aabond
Aarondirtylaundry
Abond
Aboveandbeyond
Abscond
Absconded
Absconder
Absconding
Absconds
Acceptedconduct
Accordiondoor
Achirpinginsect
Achondrite
Actiondoll
Adiamondisforheifer
Adirondack
Adirondackchair
Adirondacks