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' indicates the answer is hidden within 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" .)