Obscure Sixties spy agency facing heartless state (7)

I believe the answer is:

unclear

I'm a little stuck... Click here to teach me more about this clue!

'obscure sixties spy' is the definition.
'unclear' can be an answer for 'obscure' (thesaurus). I'm not certain of the 'sixties spy' bit.

'agency facing heartless state' is the wordplay.
'agency' becomes 'un' (UN agency is an example).
'facing' is a charade indicator (letters next to each other).
'heartless state' becomes 'clear' (clear is a kind of state. I am not sure about the 'heartless' bit.**).
'un'+'clear'='UNCLEAR'

Can you help me to learn more?

(Other definitions for unclear that I've seen before include "Ambiguous" , "Nebulous" , "Not definite" , "Not certain" , "Not easy to see or understand" .)

I've seen this clue in The Telegraph.

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