Flowers in sleigh (3)
I believe the answer is:
lei
'flowers' is the definition.
(a Hawaiian wreath of flowers)
'in sleigh' is the wordplay.
'in' says the answer is hidden in the clue.
'LEI' is hidden in the letters of 'sleigh'.
(Other definitions for lei that I've seen before include "Hawaiian garland of flowers" , "What Romanians spend" , "Hawaiin flower garland" , "Hawaiian ring of flowers" , "Band of flowers" .)