A particular kind of interest in one's underwear? (6)
I believe the answer is:
vested
'a particular kind of interest' is the definition.
'vested' can be an answer for 'interest' (vested interest is a kind of interest). I am unsure of the 'a particular kind of' bit.
'one's underwear?' is the wordplay.
I cannot quite understand how this works, but
'underwear?' could be 'vest' and 'vest' is found in the answer.
The remaining letters 'ed' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for vested that I've seen before include "This sort of interest means having a personal involvement" , "This interest has expectations of gain" , "Robed; -- interest" , "Interests may be" , "(Of an interest) already acquired" .)