Not expected to be thrown back in abandoned dustbin (6)
I believe the answer is:
sudden
'not expected' is the definition.
The answer and definition are not the same part of speech. However, past participle verbs and adjectives can occasionally define each other.
'thrown back in abandoned dustbin' is the wordplay.
'thrown back' is a reversal indicator.
'in' indicates the answer is hidden within the clue.
'neddus' is hidden in the letters of 'abandoned dustbin'.
'neddus' reversed gives 'SUDDEN'.
'to be' is the link.
Can you help me to learn more?
(Other definitions for sudden that I've seen before include "Quick and unexpected" , "Unexpected, without warning" , "Happening abruptly" , "Swift" , "Quickly, without notice or warning" .)