Follow on and acquit themselves really well (7)
I believe the answer is:
succeed
'follow' is the definition.
(synonyms)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for succeed that I've seen before include "Attain ambition" , "Take over a title from (someone)" , "Follow in order" , "Make good" , "Follow on - win" .)