Expected to combine with tricky lobs in the doubles (3)
I believe the answer is:
due
'expected' is the definition.
(similar in meaning)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for due that I've seen before include "Scheduled to arrive" , "Escort" , "Proper, appropriate" , "Appropriate - fee - now owing" , "Proper; owed" .)