Face seen in brook (11)
I believe the answer is:
countenance
This clue is a double definition.
'face' is the first definition.
(I know that countenance is a type of face)
'brook' is the second definition.
(I've seen this before)
'seen in' acts as a link.
(Other definitions for countenance that I've seen before include "Approve of - human face" , "Accept as possible; face" , "brook" , "Favour" , "Tolerate - face" .)