Cadet esteems some parts which they can't stand (6)
I believe the answer is:
detest
'can't stand' is the definition.
(I've seen this in another clue)
'cadet esteems some parts' is the wordplay.
'some parts' indicates the answer is hidden within the clue (I've seen 'some part of' mean this).
'DETEST' is hidden within 'cadet esteems'.
'which they' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for detest that I've seen before include "Having a loathing" , "Cordially dislike and loathe" , "Cordially laothe" , "Really dislike" , "Deplore" .)