Some specific people have to provide a urine sample (8)
I believe the answer is:
specimen
'sample' is the definition.
(I know that specimen is a type of sample)
'some specific people have to provide a urine' is the wordplay.
I cannot quite understand how this works, but
'people' could be 'men' (men are people) and 'men' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for specimen that I've seen before include "Exemplar" , "Something serving as an example" , "Sample taken for medical testing" , "Derogatory description of person" , "Example of type" .)