Wandered erratically over to the trading centre (5)
I believe the answer is:
roved
'wandered' is the definition.
('rove' can be a synonym of 'wander')
'erratically over to the trading centre' is the wordplay.
'erratically' indicates anagramming the letters.
'to' means one lot of letters go next to another.
'centre' says to take the centre.
The middle letter of 'trading' is 'd'.
'over' anagrammed gives 'rove'.
'rove'+'d'='ROVED'
(Other definitions for roved that I've seen before include "Wandered" , "Roamed" .)