“Go into a hotel” — the general manager’s byword? (10)

'byword?' is the definition.
(thesaurus)

'go into a hotel the general manager's' is the wordplay.
I cannot quite see how this works, but
'go' could be 'pop' (popping is a kind of going) and 'pop' is located in the answer.
'a' is found in the answer.
'hotel' could be 'h' (phonetic alphabet: alpha, bravo, charlie etc.) and 'h' is present in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?