Blair's enforcers still on top, awful bloodsuckers (7,6)

I believe the answer is:

thought police

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

'blair's enforcers' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'still on top awful bloodsuckers' is the wordplay.
'still' becomes 'though' ().
'on' is an insertion indicator.
'awful' is an anagram indicator.
'bloodsuckers' becomes 'lice' (bloodsucking creatures).
'top' anagrammed gives 'tpo'.
'though' placed within 'tpo' is 'thoughtpo'.
'thoughtpo'+'lice'='THOUGHT POLICE'

Can you help me to learn more?

(Other definitions for thought police that I've seen before include "PC monitors" , "1984 body requiring absolute conformity" , "Orwellian monitoring force" .)

I've seen this clue in The Independent.

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