Picked up ruthenium, hydrogen, and also ________? (7)
I believe the answer is:
Here is my best explanation:
'?' is the definition.
I can't tell whether this definition defines the answer.
'picked up ruthenium hydrogen and also' is the wordplay.
'picked up' says the letters should be written in reverse.
'ruthenium' becomes 'ru' (Ru is the chemical symbol for ruthenium).
'hydrogen' becomes 'h' (chemical symbol).
'and' means one lot of letters go next to another.
'also' becomes 'plus' (synonyms).
'ruhplus' in reverse letter order is 'SULPHUR'.