Debrief Ezekiel about a hat (3)
I believe the answer is:
fez
'a hat' is the definition.
(fez is a kind of hat)
'debrief ezekiel about' is the wordplay.
'about' indicates a hidden word (the clue goes around or about the answer).
'FEZ' is hidden in the letters of 'debrief ezekiel'.
(Other definitions for fez that I've seen before include "Egyptian felt cap" , "Tasselled hat" , "Middle Eastern headgear" , "Turkish tasselled cap" , "High flat-topped red cap with tassel worn by some Muslims" .)