Drums time — annoying child has a new one (7)
I believe the answer is:
timpani
'drums' is the definition.
(type of drums)
'time annoying child has a new one' is the wordplay.
'time' becomes 't' (abbreviation).
'annoying child' becomes 'imp' (imp is a kind of child. I am not sure about the 'annoying' bit.).
'has' says to put letters next to each other.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'one' becomes 'i' (Roman numeral).
't'+'imp'+'a'+'n'+'i'='TIMPANI'
Can you help me to learn more?
(Other definitions for timpani that I've seen before include "Percussion section" , "Something making drumming noise" , "Percussion instrument" , "Set of kettledrums" , "> kitchen equipment?" .)