Minor drama - that's easy (6,4)
I believe the answer is:
childs play
'easy' is the definition.
(I've seen this before)
'minor drama' is the wordplay.
'minor' becomes 'child' (synonyms).
'drama' becomes 'splay' (I can't explain this - if you can you should give a lot more credence to this answer).
'child'+'splay'='CHILDS-PLAY'
'that's' is the link.
Can you help me to learn more?
(Other definitions for childs play that I've seen before include "simple task" , "Something very easy to do" , "A dramatisation of the nativity" , "A doddle" , "Peter Pan, say, on stage" .)