Goods initially inferior — look angry (6)
I believe the answer is:
glower
'look angry' is the definition.
(I've seen this before)
'goods initially inferior' is the wordplay.
'initially' indicates taking the first letters.
'inferior' becomes 'lower' (synonyms).
The first letter of 'goods' is 'g'.
'g'+'lower'='GLOWER'
(Other definitions for glower that I've seen before include "Look hotly or angrily" , "Glare" , "Fierce look" , "shiner?" , "firefly?" .)