Small - and that's how it's meant to make one feel (6)
I believe the answer is:
slight
'small' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for slight that I've seen before include "Snub - not much!" , "Put down" , "Aspersion" , "of no great significance" , "Insult, affront" .)