Very pleasantly? Exactly! (6)

I believe the answer is:
nicely
'exactly' is the definition.
(thesaurus)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for nicely that I've seen before include "Agreeably, respectably" , "Good-naturedly" , "Agreeably, delightfully" , "'Amiably, pleasantly (6)'" , "well - with 16d" .)
