Sets great store by particular details (8)
I believe the answer is:
respects
'details' is the definition.
(I know this)
'sets great store by particular' is the wordplay.
I cannot quite see how this works, but
'particular' could be 'spec' (I've seen this in another clue) and 'spec' is present in the answer.
The remaining letters 'rets' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for respects that I've seen before include "Observes" , "Polite regards" , "Compliments" , "what may be paid by callers" , "Particulars" .)