Work as a dentist or doctor with the sick (5)
I believe the answer is:
drill
'work as a dentist' is the definition.
I can't judge whether this defines the answer.
'doctor with the sick' is the wordplay.
'doctor' becomes 'Dr' (synonyms).
'with' says to put letters next to each other.
'the sick' becomes 'ill' (I've seen this before).
'dr'+'ill'='DRILL'
'or' acts as a link.
Can you help me to learn more?
(Other definitions for drill that I've seen before include "Tool for boring holes" , "Exercise - bore a hole" , "Train (by repeated practice)" , "(Correct) procedure" , "Rehearsal of the procedure to be followed in an emergency" .)