Female swine hoovering up knight’s cocaine (4)
I believe the answer is:
snow
'cocaine' is the definition.
(I know that snow is a type of cocaine)
'female swine hoovering up knight's' is the wordplay.
I cannot quite see how this works, but
'knight' could be 'n' (chess abbreviation) and 'n' is found within the answer.
'female' could be 'sow' (female pig) and 'sow' is present in the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for snow that I've seen before include "Ice crystal precipitation" , "Basic White Christmas ingredient" , "Wintry stuff" , "Wintry flakes?" , "Wintry precipitation" .)