As usual, dad's given a rousing start (3)
I believe the answer is:
par
'as usual' is the definition.
'par' can be an answer for 'usual' (par is an average golf score). I'm unsure of the 'as' bit.
'dad's given a rousing start' is the wordplay.
'dad' becomes 'pa' (both can mean one's father).
'given' is a charade indicator (letters next to each other).
'start' indicates taking the first letters.
The initial letter of 'rousing' is 'r'.
'pa'+'r'='PAR'
Can you help me to learn more?
(Other definitions for par that I've seen before include "Average or even, as for the course" , "Rap for being average" , "Standard number of strokes for a golf hole" , "standard for course" , "Standard amount" .)