Thought to bring article forward for assistant (4)
I believe the answer is:
aide
'for assistant' is the definition.
(aide is a kind of assistant)
'thought to bring article forward' is the wordplay.
I cannot quite see how this works, but
'article' could be 'a' (the indefinite article in English) and 'a' is located in the answer.
The remaining letters 'ide' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for aide that I've seen before include "Officer who acts as military assistant" , "a help" , "Assistant to a more senior person" , "Right-hand man/woman" , "one helping" .)