Dad's got time for his hobby! (7)
'his hobby' is the definition.
'pastime' can be an answer for 'hobby' (I've seen this before). I am not certain of the 'his' bit.
'dad's got time' is the wordplay.
'dad's' becomes 'pa's' ('pa' can be a synonym of 'dad').
'got' is a charade indicator (letters next to each other).
'for' acts as a link.
Can you help me to learn more?
(Other definitions for pastime that I've seen before include "Hobby; regular activity", "Leisure pursuit", "diversion", "doing the crossword, say", "Leisure activity".)