English bishop maintaining the old-fashioned line in facial hair (7)
I believe the answer is:
eyebrow
'facial hair' is the definition.
(I've seen this before)
'english bishop maintaining the old-fashioned line' is the wordplay.
'english' becomes 'e' (abbreviation).
'bishop' becomes 'B' (chess abbreviation).
'maintaining' is an insertion indicator (inserted letters are held or maintained).
'the old' becomes 'ye' (resembles a historical spelling of 'the').
'fashioned line' becomes 'row' (I can't explain this - if you can you should give a lot more credence to this answer).
'e'+'b'='eb'
'eb' enclosing 'ye' is 'eyeb'.
'eyeb'+'row'='EYEBROW'
'in' is the link.
Can you help me to learn more?
(Other definitions for eyebrow that I've seen before include "Arch of hair" , "surprisingly elevated" , "What's raised in surprise" , "one's raised disapprovingly" , "raising this in disapproval?" .)