Doctor puts pressure on cleaner (3)
I believe the answer is:
mop
'cleaner' is the definition.
(something which 'cleans')
'doctor puts pressure' is the wordplay.
I cannot quite understand how this works, but
'doctor' could be 'mo' (medical officer) and 'mo' is found within the answer.
'pressure' could be 'p' (scientific abbreviation) and 'p' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'on' is the link.
Can you help me to learn more?
(Other definitions for mop that I've seen before include "Mass of disordered hair" , "Floor cleaner" , "Wet cleaner" , "A thick mass of hair on head" , "Finish off a task - . . . up" .)