Worn out, as mostly predicted, strangely (8)
I believe the answer is:
decrepit
'worn out' is the definition.
(I've seen this before)
'mostly predicted strangely' is the wordplay.
'mostly' means to remove the last letter.
'strangely' indicates anagramming the letters.
'predicted' with its last letter taken away is 'predicte'.
'predicte' with letters rearranged gives 'DECREPIT'.
'as' acts as a link.
(Other definitions for decrepit that I've seen before include "ruined by neglect" , "Frail and creaky" , "past its best" , "rickety" , "Feeble - dilapidated" .)