The most common and most likely answer to this crossword clue is the 7 letter word POPPIES
I've seen this crossword clue in The Guardian
P
O
P
P
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More clues leading to the result POPPIES
Buddy explains!
The straight part
We know that "Source for drugs /Source for drugs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case source for drugs /source for drugs = poppies.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does POPPIES mean?
POPPIES noun- Any plant of the genus Papaver or the family Papaveraceae, with crumpled, often red, petals and a milky juice having narcotic properties; especially the common poppy or corn poppy (Papaver rhoeas) which has orange-red flowers; the flower of such a plant.
- A bright red colour tinted with orange, like that of the common poppy flower.
- A simple artificial poppy flower worn in a buttonhole or displayed in other contexts to remember those who died in the two World Wars and other armed conflicts, especially around Remembrance Sunday.
- One's father or grandfather, or a male authority figure having similar standing.