Rumoured defect attached to new drug in entry level (6,5)

I believe the answer is:

ground floor

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'entry level' is the definition.
(where you enter a building)

'rumoured defect attached to new drug' is the wordplay.
'rumoured' indicates a 'sounds like' (homophone) clue.
'defect' becomes 'flaw' (synonyms).
'attached to' says to put letters next to each other.
'new drug' becomes 'ground' (I can't explain this - if you can you should believe this answer much more).
'flaw' sounds like 'floor'.
'floor' put after 'ground' is 'GROUND-FLOOR'.

'in' is the link.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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