Heavy responsibility embraced by EastEnders star? On the contrary (7)
I believe the answer is:
onerous
'heavy' is the definition.
(similar in meaning)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for onerous that I've seen before include "Burdensome as duty may be" , "Involving much effort" , "Burdensome, demanding" , "Challenging" , "quite a burden if so" .)