Moor and Serb manufacture headgear (8)
I believe the answer is:
sombrero
'headgear' is the definition.
(sombrero is a kind of headgear)
'moor and serb manufacture' is the wordplay.
'and' means one lot of letters go next to another (I've seen this in other clues).
'manufacture' indicates anagramming the letters.
'moor' after 'serb' is 'serbmoor'.
'serbmoor' is an anagram of 'SOMBRERO'.
(Other definitions for sombrero that I've seen before include "Mexican's hat" , "Broad-brimmed Mexican hat" , "Wide-brimmed hat of Mexico" , "It may be felt" , "headgear in parts of US" .)