Specialization (5)
I believe the answer is:
niche
'specialization' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for niche that I've seen before include "Chine (anag) - suitable place in life" , "Recess; comfy corner" , "Select place in market" , "Recess in wall for statue" , "Well-suited position" .)