Fellow taking an extreme position in SW England? (10)
I believe the answer is:
cornishman
'position in sw england?' is the definition.
The definition suggests a singular noun which matches the answer.
'fellow taking an extreme' is the wordplay.
I cannot quite understand how this works, but
'fellow' could be 'man' (fellow can mean a man) and 'man' is found in the answer.
'an' could be 'i' (Roman numeral for one) and 'i' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for cornishman that I've seen is " Westerner".)