Silly, fashionable article ending in garbage (5)
I believe the answer is:
inane
'silly' is the definition.
(I've seen this before)
'fashionable article ending in garbage' is the wordplay.
'fashionable' becomes 'in' (in can mean fashionable or trendy).
'article' becomes 'an' (indefinite article).
'ending in' suggests the final letters.
The last letter of 'garbage' is 'e'.
'in'+'an'+'e'='INANE'
(Other definitions for inane that I've seen before include "Empty-headed" , "Lacking meaning" , "Delirious" , "Mindlessly silly" , "Witless and pointless" .)