Given third class ranking, and boxed (6)
I believe the answer is:
crated
'boxed' is the definition.
(I've seen this before)
'given third class ranking' is the wordplay.
I cannot really understand how this works, but
'class' could be 'rate' (class can mean to rank or rate) and 'rate' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'and' is the link.
Can you help me to learn more?
(Other definitions for crated that I've seen before include "ready to be dispatched" , "Boxed" .)