Boast about wooden shoe (5)
I believe the answer is:
sabot
'boast about wooden shoe' is the definition.
(I've seen this before)
'boast about' is the wordplay.
'about' indicates anagramming the letters.
'boast' anagrammed gives 'SABOT'.
(Other definitions for sabot that I've seen before include "French clog" , "footwear from Paris" , "French wooden shoe" , "Simple shoe" , "Carved shoe -- boats (anag)" .)