Promiscuous person's soft blanket (6)
I believe the answer is:
player
'promiscuous person's' is the definition.
'player' can be an answer for 'person's' (player is a kind of person). I am not sure about the 'promiscuous' bit.
'soft blanket' is the wordplay.
I cannot quite see how this works, but
'soft' could be 'p' (musical abbreviation for 'piano', soft) and 'p' is located in the answer.
The remaining letters 'layer' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for player that I've seen before include "Important participant" , "Participant in sport or game" , "Batsman perhaps" , "Sports team member" , "Participant in competitive game" .)