Is there a secret service counterpart to Clausewitz?
Let's say you've got to caluminate some notorious nay-sayer or to render the mom of some bomb-throwing anarchist more coöperative - do you rely on the local, autochtonous, tradition? Are your measures invented anew every time? Would your foreign colleagues understand your jargon? Do you even have your special literature or do you rely on militaria and on criminology classics instead?
Well, we need to know more of what you are looking for.
Are you looking specifically at what is often considered "Clandestine Service" or "Analyst"? They are two very distinctively different jobs within the intelligence community.
To clarify, "Clandestine Services" would be the classic image of "the spy in the field". This is your James Bond, field spy stuff. "Analyst" would be largely the people who analyse the data collected by Clandestine Services, signals intelligence, media observation, etc., and use it based upon their specialized field of expertise (everything from electronics, to physics, to medicine, to computers, to psychology, to anthropology), to produce actionable intelligence estimates and predictions.
There is a wide gulf between the two.