The odd bit of crumpet (3)
I believe the answer is:
rum
'the odd' is the definition.
(rum can mean strange or dubious)
'bit of crumpet' is the wordplay.
'bit of' says the answer is hidden in the clue.
'RUM' is hidden within 'crumpet'.
(Other definitions for rum that I've seen before include "Odd sort of spirit used in grog" , "The spirit is peculiar" , "Spirit (in the punch?)" , "Droll" , "Odd like drink distilled from molasses" .)