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 tell whether this defines the answer.
'ten about to get changed' is the wordplay.
'about' is an anagram indicator.
'to' means one lot of letters go next to another (I've seen this in other clues).
'get changed' becomes 'differ' (I am not sure about this - if you are sure you should believe this answer much more).
'ten' is an anagram of 'ent'.
'ent' put 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" .)