Disciplinarian's point in trading centre (8)
I believe the answer is:
martinet
'disciplinarian's' is the definition.
(synonyms)
'point in trading centre' is the wordplay.
'point' becomes 'tine' (I've seen this in other clues).
'in' indicates putting letters inside.
'trading centre' becomes 'mart' (I've seen this before).
'tine' inserted within 'mart' is 'MARTINET'.
(Other definitions for martinet that I've seen before include "Strict disciplinarian - met train (anag)" , "Stickler for discipline" , "One demands exact conformity to rules" , "Trite man becomes a tyrant" , "Tyrant, one who demands strict obedience" .)