Heads of publicity back from fashion party (12)

I believe the answer is:

promontories

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

'heads' is the definition.
The answer and definition can be both natural objects as well as being plural nouns.
Maybe there's a link between them I don't understand?

'publicity back from fashion party' is the wordplay.
'publicity' becomes 'promo' (short for promotion).
'back from' indicates one should take the final letters (the letter at the back of the word).
'party' becomes 'tories' (I am not sure about this - if you are sure you should believe this answer much more).
The final letter of 'fashion' is 'n'.
'promo'+'n'+'tories'='PROMONTORIES'

'of' is the link.

Can you help me to learn more?

(Another definition for promontories that I've seen is " Capes".)

I've seen this clue in The Guardian.

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