Answer: flag

AnswerCrossword Clue
FLAGOld Glory, for one
FLAGMailbox attachment
FLAGPatriotic symbol
FLAGSwitzerland's is square
FLAGItem used in semaphore signaling
FLAGSomething to stand for
FLAGStars and Stripes, notably
FLAGCheckered item at the race track
FLAGMark for attention
FLAGOne with a support staff?
FLAGReferee's signal
FLAGThe skull and crossbones, e.g.
FLAGMarker on a green
FLAGMark, in a way
FLAGBanner
FLAGSkull and crossbones, e.g.
FLAGSemaphore object
FLAGPennant
FLAGGolfer's target
FLAGJune 14th honoree
flagto lose energy or interest
FLAGKey inspiration
FLAGLose strength
FLAGPiece of bunting
FLAGMasthead
FLAGBegin to droop
FLAGStratego piece
FLAGWaver in the wind
FLAGOne posted outside an embassy
FLAGEmbassy adornment
FLAGEmbassy identifier
FLAGJolly Roger, for one
FLAGStars and Stripes, e.g.
FLAGA ref may drop one
FLAGNational symbol
FLAGColorful symbol, often
FLAGRef's throw
FLAGHail, with "down"
FLAGStandard
FLAGPenalty ..