King is in a bad mood receiving creeps (6)
I believe the answer is:
skulks
'receiving creeps' is the definition.
The definition and answer can be both to do with motion as well as being verbs in their -s form.
Maybe there's a link between them I don't understand?
'king is in a bad mood' is the wordplay.
'king' becomes 'K' (chess abbreviation).
'is in' is an insertion indicator.
'a bad mood' becomes 'sulks' (I can't justify this - if you can you should believe this answer much more).
'k' put inside 'sulks' is 'SKULKS'.
Can you help me to learn more?
(Other definitions for skulks that I've seen before include "Loiters stealthily, lurks" , "Hides or lurks, planning mischief" , "Lurks, sneaks, prowls" , "Loiters and moves stealthily" .)