What does the cryptic crossword clue "Some medicine making us drowsier, oddly (4)" mean?

The definition is "oddly". The wordplay uses a hidden word. DO (deletion) + S (deletion) + E (deletion) + (deletion) = DOSE The answer is DOSE.

Some medicine making us drowsier, oddly (4)

Guardian Cryptic #28217 | 27 Down | 2020-08-20 flower