Spooner’s suspended herb in filthy place (8)

I believe the answer is:

dunghill

'filthy place' is the definition.
(filthy or dirty place)

I cannot understand how the remainder of the clue works.

(Other definitions for dunghill that I've seen before include "Pile of manure" , "Muckheap" , "foul place" , "Farmyard refuse heap" , "Faecal heap" .)

I've seen this clue in The Times.

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