Little, not large spot (5)
I believe the answer is:
sight
'spot' is the definition.
(both can mean to notice or observe)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for sight that I've seen before include "Glimpse" , "Bodily faculty" , "Observe" , "Spot - eyesore" , "Vision, ability to see" .)