Spruce from small trading centre (5)
I believe the answer is:
smart
'spruce' is the definition.
(synonyms)
'small trading centre' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'trading centre' becomes 'mart' (I've seen this before).
's'+'mart'='SMART'
'from' acts as a link.
(Other definitions for smart that I've seen before include "astute" , "Clever or dapper" , "Rankle; trim" , "Well turned out" , "Spruce; sting" .)