Crossword Genius

Chief on drugs finding something on computer (4,3)

Ross

I believe the answer is:

hash key

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

'something on computer' is the definition.
(symbol on a computer keyboard)

'chief on drugs' is the wordplay.
I cannot really understand how this works, but
'chief' could be 'key' (I've seen this in another clue) and 'key' is present in the answer.
'drugs' could be 'hash' (hashish is a drug) and 'hash' is present in the answer.
No letters remain.
This explanation may well be incorrect...

'finding' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.
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