Elvers

9 clues
Glass eels
Young eels
Young congers
Baby wrigglers
Stream migrators
Little wrigglers
Slim young swimmers
Young, transparent fish
___ Have Left the Building" (an alternative title for this puzzle)
Similar answers:
Abasers
Abaters
Abcmurders
Abetters
Abiders
Ablepersonality
Abners
Abnersingleday
Abombers
Aborters
Aboveallothers
Abraders
Abridgedversion
Abridgers
Abroodofthinkers
Absoluterulers
Abstainers
Abunchofvintners
Abusers
Acadapters