Doctor spent dime on coffee, initially (5)
I believe the answer is:
medic
'doctor' is the definition.
(doctor is a type of medic)
'spent dime on coffee initially' is the wordplay.
'spent' indicates anagramming the letters.
'on' means one lot of letters go next to another.
'initially' says to take the initial letters.
The first letter of 'coffee' is 'c'.
'dime' is an anagram of 'medi'.
'medi'+'c'='MEDIC'
(Other definitions for medic that I've seen before include "Eg, doctor" , "Physician (informal)" , "Health worker" , "What was Basutoland" , "He may offer treatment" .)