'Stayin' Alive' excites one headed to dance (9)
I believe the answer is:
existence
'stayin alive' is the definition.
I can't judge whether this definition defines the answer.
'excites one headed to dance' is the wordplay.
'headed' means to remove the first letter (head can mean to remove the top from something).
'to dance' indicates an anagram (letters must dance around).
'one' with its initial letter removed is 'ne'.
'excites'+'ne'='excitesne'
'excitesne' with letters rearranged gives 'EXISTENCE'.
Can you help me to learn more?
(Other definitions for existence that I've seen before include "A way of living" , "survival" , "State of being" , "Way of life" , "The business of being" .)