A couple of chaps producing headgear in Scotland (9)
I believe the answer is:
glengarry
'headgear in scotland' is the definition.
'Glengarry' can be an answer for 'headgear' (Glengarry is an example). I'm unsure of the 'in scotland' bit.
'a couple of chaps' is the wordplay.
'a couple of chaps' means two replacements for 'chap'.
'chap' becomes 'glen'.
'chap' becomes 'garry' ().
'glen'+'garry'='GLENGARRY'
'producing' acts as a link.
Can you help me to learn more?
(Other definitions for glengarry that I've seen before include "Highland dress hat" , "headgear" , "Scottish (military) cap" , "Scottish Highlander's cap" , "Highlanders' cap with ribbons" .)