British parts in Man of La Mancha? (6)
I believe the answer is:
hombre
'man of la mancha?' is the definition.
(I've seen this in another clue)
'british parts in' is the wordplay.
'british' becomes 'br' (abbreviation for British).
'parts' indicates putting letters inside (inserted letters separate or part others).
'in' becomes 'home' ('he's in' can mean 'he's home').
'br' put within 'home' is 'HOMBRE'.
(Other definitions for hombre that I've seen before include "A man (Sp)" , "Western guy" , "American man" , "Spanish fellow" .)