If Fred were let off at ten, about, to get changed (9)
I believe the answer is:
different
'if fred were let off' is the definition.
I can't judge whether this definition defines the answer.
'ten about to get changed' is the wordplay.
'about' indicates anagramming the letters.
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'get changed' becomes 'differ' (I can't explain this - if you can you should believe this answer much more).
'ten' with letters rearranged gives 'ent'.
'ent' after 'differ' is 'DIFFERENT'.
'at' acts as a link.
Can you help me to learn more?
(Other definitions for different that I've seen before include "Distinct, separate" , "Dissimilar, unlike" , "Unusual" , "Otherwise" .)