Answer: efs

AnswerCrossword Clue
EFSOffice couple?
EFSFailing grades
EFS4-point Scrabble tiles
EFSAwful grades
EFSLetters starting many military plane names
EFSA lot of fluff
EFSTwo of fifty
EFS40% of fifty?
EFSAffluent duo?
EFSFlunking grades
EFSBad marks
EFSLead film festival characters?
EFSG.P.A. destroyers
EFSVery bad grades
EFSInsufferable pair?
EFSFalstaff finale?
EFSTrio in fluff
EFSTranscript flaws
EFSBefore gee: pl.
EFSTranscript standouts
EFSLetters that flunk
EFSFluff trio
EFSLetters before gees
EFSTwo out of fifty?
EFSTwo-thirds off?
EFSPair of earmuffs?
EFSBeginnings of fame and fortune?
EFSG.P.A. killers
EFSThey're worth 0 toward G.P.A.s
EFSBuffet centerpiece?
efsthe letter f
efsEF, the letter F
EFSJeff has two
EFSDaffy duo?
EFSGees' predecessors
EFSLetters
EFSFluffy's threesome
EFSTwo of fifteen?
EFSAbysmal grades
EFSMarks of failure