Ashes holder punching Aussie bounder in tour (7)
I believe the answer is:
journey
'tour' is the definition.
(thesaurus)
'ashes holder punching aussie bounder' is the wordplay.
'ashes holder' becomes 'urn' (I've seen this in another clue).
'punching' means one lot of letters goes inside another (inserted letters punch or puncture others).
'aussie bounder' becomes 'joey' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'urn' inserted into 'joey' is 'JOURNEY'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for journey that I've seen before include "Trip; travel" , "Expedition" , "Trek" , "Voyage" , "'Trip, excursion (7)'" .)