Last to finish medicine with no cap (6)
I believe the answer is:
endure
'last' is the definition.
(I know that last can be written as endure)
'finish medicine with no cap' is the wordplay.
'finish' says to take the final letters.
'with' says to put letters next to each other.
'no' becomes 'n' (common abbreviation).
'cap' becomes 'dure' (I can't explain this - if you can you should give a lot more credence to this answer).
The last letter of 'medicine' is 'e'.
'e'+'n'+'dure'='ENDURE'
'to' is the link.
Can you help me to learn more?
(Other definitions for endure that I've seen before include "Bear without giving up" , "Bear, stick it out" , "Last or suffer patiently" , "Abide" , "Last or tolerate" .)