Crossword Genius

Possesses heroin at first and pot (4)

Ross

I believe the answer is:

hash

'pot' is the definition.
(hash is a kind of pot)

'possesses heroin at first' is the wordplay.
'possesses' becomes 'has' ('have' can be a synonym of 'possess').
'at first' indicates taking the first letters.
The initial letter of 'heroin' is 'h'.
'has'+'h'='HASH'

'and' is the link.

(Other definitions for hash that I've seen before include "Mess; meat/potato dish" , "chop into small pieces" , "What signifies a number" , "Recooked dish for shah" , "Keypad symbol" .)

I've seen this clue in The Telegraph and The Globe and Mail.
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