Likelihood of dangerous drug supply being found by police officer (4)
I believe the answer is:
odds
'likelihood' is the definition.
(what are the odds?)
'dangerous drug supply being found by police officer' is the wordplay.
I cannot really understand how this works, but
'drug' could be 'od' (o.d.ing is a kind of drugging) and 'od' is present in the answer.
'police officer' could be 'ds' (abbreviation for Detective Sergeant) and 'ds' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'of' is the link.
Can you help me to learn more?
(Other definitions for odds that I've seen before include "familiar to our betters?" , "(In betting) chances" , "Chances expressed as a ratio" , "The likelihood of something occurring rather than not" , "Probabilities" .)