The Clue
They're flashed at guards (3 letter answer)
The Answer
IDS
Tags
Notes
The answer IDS is seen frequently, appearing about once every 110 puzzles.
Related Clues
Fingers
Tags
Barkeep's request
Barkeeps' requests
Bouncers' requests
Bracelets, at times
Driver's lic. et al.
Freud's concerns
Libido hubs
Parts of psyches
Psyche parts
Psychiatric terms
Recognizes, briefly
Roadblock requests
Some bracelets
Badges, e.g., in brief
Bouncers' requests, briefly
Cards with photos, for short
Check-cashing needs
Dog tags, e.g.
Dog tags for G.I.'s
Driver's lic. and others
Employee card and others
G.I. dog tags
Proofs of age, for short
Some cards, for short
They're checked at the door
Wallet cards: Abbr.
Wallet items, in brief
Wallet items, informally
Air travel needs, for short
Beer buyers' needs, for short
Bouncers check them: Abbr.
Bouncers check them, briefly
Driver's licenses and such, for short
Employee cards and such, briefly
Items checked before flying
Passports and driver's licenses, for short
Picks out in a lineup, for short
Picks out of a lineup, for short
Some purse items, for short
Checks at the door, say
They're checked at checkpoints, briefly
Definition
ID as a noun:
1. (Idaho, Gem State, ID) = a state in the Rocky Mountains
2. (ID, I.D.) = a card or badge used to identify the bearer; "you had to show your ID in order to get in"
3. (psychoanalysis) primitive instincts and energies underlying all psychic activity