Due to be called for? (8)
I believe the answer is:
expected
'due' is the definition.
(similar in meaning)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for expected that I've seen before include "Considered likely or probable to happen" , "Assumed; required as due" , "Anticipated" , "Awaited - required" , "Seen as likely to happen" .)