Increasingly blunt head of state revealing all (8)
I believe the answer is:
starkers
'revealing all' is the definition.
(informal term for naked)
'increasingly blunt head of state' is the wordplay.
I cannot really understand how this works, but
'state' could be 'ark' (I've seen this before) and 'ark' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for starkers that I've seen before include "23 [NUDIST]" , "Slangily nude - starts being stellar" , "Wearing no clothes" , "in his birthday suit?" , "in the buff" .)