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Awful, unending pong if hotel guest makes mistake (4,2,3,6)

Ross

I believe the answer is:

slip of the tongue

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

'mistake' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'awful unending pong if hotel guest' is the wordplay.
'awful' indicates anagramming the letters.
'unending' means to remove the last letter (the word doesn't have its end letter).
'pong' with its final letter taken off is 'pon'.
'pon'+'if'+'hotel'+'guest'='ponifhotelguest'
'ponifhotelguest' is an anagram of 'SLIP OF THE TONGUE'.

'makes' acts as a link.

Can you help me to learn more?

(Other definitions for slip of the tongue that I've seen before include "mistake one hears" , "Error in words" , "a small error" , "vocal error" .)

I've seen this clue in The Telegraph.
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