Speciality (5)
I believe the answer is:
forte
'speciality' is the definition.
(I know that speciality can be written as forte)
This is the entire clue.
(Other definitions for forte that I've seen before include "In music, to be played loudly" , "Loud (mus.)" , "Skill" , "speciality" , "Strong point - loudly (in music)" .)