First to limbo dance outside — absolute revelation (10)
I believe the answer is:
disclosure
'revelation' is the definition.
('disclosure' can be a synonym of 'revelation')
'first to limbo dance outside absolute' is the wordplay.
'first to' suggests taking the first letters.
'dance' becomes 'disco' (I've seen this before**).
'outside' means one lot of letters goes inside another.
'absolute' becomes 'sure'.
The first letter of 'limbo' is 'l'.
'l' put inside 'disco' is 'disclo'.
'disclo'+'sure'='DISCLOSURE'
(Other definitions for disclosure that I've seen before include "leak" , "revealing" , "Release" , "Laying bare" , "Act of revelation" .)