Raised fuss then dashed inside promptly (2,3,3)
I believe the answer is:
on the dot
'promptly' is the definition.
(on the dot means precisely at the appointed time)
'raised fuss then dashed inside' is the wordplay.
'raised' says the letters should be written in reverse (going up in a down clue).
'fuss' becomes 'todo' (both can mean a commotion).
'dashed' indicates an anagram.
'inside' indicates putting letters inside.
'todo' in reverse letter order is 'odot'.
'then' is an anagram of 'nthe'.
'odot' going around 'nthe' is 'ON THE DOT'.
(Other definitions for on the dot that I've seen before include "at exactly the arranged time" , "At precisely the right time" , "Precisely punctual" , "Sharp" , "Absolutely punctual" .)