Dead — hanged in awfully secret plan (6,6)

I believe the answer is:

hidden agenda

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

'secret plan' is the definition.
'hidden agenda' can be an answer for 'plan' (I have seen 'covert plan' mean 'hidden agenda' so perhaps 'plan' could also mean 'hidden agenda'). I am unsure of the 'secret' bit.

'dead hanged in awfully' is the wordplay.
'awfully' indicates an anagram.
'dead'+'hanged'+'in'='deadhangedin'
'deadhangedin' is an anagram of 'HIDDEN AGENDA'.

Can you help me to learn more?

(Other definitions for hidden agenda that I've seen before include "Concealed intentions" , "Ulterior motive" , "Secret motive behind one's actions" , "covert plan" , "Undisclosed reason" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.