Answer: nut

AnswerCrossword Clue
NUTCashew, for one
NUTTrail mix bit
NUTBig-time fan
NUTBolt's mate
NUTEnthusiast
NUTTough .. to crack
NUTWaldorf-salad tidbit
NUTAvid devotee
NUTDing-a-ling
NUTKook
NUTWeirdo
NUTEccentric
NUTGeometric fastener
NUTDiehard fan
NUTCrackpot
NUTFancier and then some
NUTWacko
NUTDevotee
NUTOddball
NUTPecan or hickory
nutperforated block usually of metal that has an internal screw thread and is used on a bolt or screw for tightening or holding something
NUTPea ender
NUTCashew
NUTOff-the-wall guy
NUTScrewball
NUTBrazil or pecan
NUTChest or dough finisher
NUTHazel, for one
NUTFlake
NUTLitchi or flake
NUTMacadamia, for one
NUTBread or butter ender
NUTFanatic
NUTKola, e.g.
NUTAlmond, e.g.
NUTSomething you might have a crack at
NUTSquirrel's stash
NUTHickory seed
NUTFilbert, e.g.
NUTFastening device