First of teeth, perfect, coming up, do this? (5)
I believe the answer is:
erupt
'do this?' is the definition.
The definition suggests a singular noun but the answer is not.
'first of teeth perfect coming up' is the wordplay.
'first of teeth' becomes 't' (1st letter of 'teeth').
'perfect' becomes 'pure' (synonyms).
'coming up' is a reversal indicator.
't'+'pure'='tpure'
'tpure' in reverse letter order is 'ERUPT'.
Can you help me to learn more?
(Other definitions for erupt that I've seen before include "Blow up like volcano" , "Explode" , "Break forth" , "go up" , "Suddenly appear" .)