Deeply impress (3)
I believe the answer is:
awe
'deeply impress' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for awe that I've seen before include "Reverential feeling" , "A mix of fear and wonder" , "Profound respect" , "Amazed wonder" , "Feeling of wonder or admiration" .)