Experience not easy on an old invader (2,7)
I believe the answer is:
go through
'experience' is the definition.
(synonyms)
'easy on an old invader' is the wordplay.
'easy' becomes 'rough' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'on' says to put letters next to each other.
'an old invader' becomes 'goth' (I've seen this before).
'rough' put after 'goth' is 'GO THROUGH'.
'not' acts as a link.
Can you help me to learn more?
(Other definitions for go through that I've seen before include "Face" , "be accepted" , "Suffer from" , "Use up - experience" , "brave" .)