Answer:

SAM

AnswerCrossword Clue
SAM"As Time Goes By" singer in "Casablanca"
SAM"I Want You" uncle
SAMHe sang with The Pharaohs
SAMLegendary Snead
SAMPlaywright Shepard
SAMWalton of Wal-Mart
SAMWaterston or Snead
SAMNational uncle
SAMPatriotic uncle
SAMPianist at Rick's
SAMUSA's "Uncle"
SAMUnited States uncle
SAMAmerican Uncle
SAMUncle often seen recruiting
SAM"What in .. Hill ...?"
SAMOnetime ruler of 23A
SAMHouston or Spade
SAM"Stay With Me" singer Smith
SAMSpade the sleuth
SAMCasablanca musician
SAMMissile type
SAMMuppet eagle
SAM"Casablanca" musician
SAM"Casablanca" piano man
SAMWalton or Waterston
SAM"Casablanca" pianist
SAM2006 winner Hornish
SAMPal of Frodo
SAMFrodo's friend
SAMSoulful Cooke
SAMPulitzer-winner Shepard
SAM"Cheers" bartender Malone
SAMDirector Raimi
SAMSenate Watergate committee chairman Ervin
SAM"As Time Goes By" player
SAMLongtime speaker of the House Rayburn
SAM... Spade, hero of "The Maltese Falcon"
SAM"Only Sixteen" singer Cooke
SAM"As Time Goes By" pianist
SAMNoted uncle