Emphasised under strain (8)
I believe the answer is:
stressed
I believe this is a double definition.
'emphasised' is the first definition.
('stress' can be a synonym of 'emphasize')
'under strain' is the second definition.
(I've seen this before)
(Other definitions for stressed that I've seen before include "Tense; highlighted" , "Emphasised, underlined" , "Pressurised, strained" , "Screwed up" , "exerted pressure" .)