Chance it in rearrangement as practical expert (10)
I believe the answer is:
technician
'practical expert' is the definition.
'technician' can be an answer for 'expert' (technician is a kind of expert). I'm unsure of the 'practical' bit.
'chance it in rearrangement' is the wordplay.
'rearrangement' indicates an anagram.
'chance'+'it'+'in'='chanceitin'
'chanceitin' is an anagram of 'TECHNICIAN'.
'as' is the link.
Can you help me to learn more?
(Other definitions for technician that I've seen before include "One doing practical work in a laboratory" , "Skilled workman" , "Engineer" , "Skilled lab worker" .)