Start on instruction, right away causing amusement (12)
I believe the answer is:
entertaining
'causing amusement' is the definition.
I can't judge whether this defines the answer.
'start on instruction right away' is the wordplay.
'start on' becomes 'enter' (I've seen this in another clue. I am not sure about the 'on' bit.).
'instruction' becomes 'training' (I've seen this before).
'right' becomes 'r' (abbreviation).
'away' suggests deleting specific letters.
'training' with 'r' taken away is 'taining'.
'enter'+'taining'='ENTERTAINING'
Can you help me to learn more?
(Other definitions for entertaining that I've seen before include "creating a diversion" , "At home" , "Comical" , "Considering - holding a party" , "Enjoyable" .)