Contradict sources of vigorous explanation provided by brand - it's pretence (4-7)
I believe the answer is:
make-believe
'it's pretence' is the definition.
(I've seen this before)
'contradict sources of vigorous explanation provided by brand' is the wordplay.
'contradict' becomes 'belie' (synonyms).
'sources of vigorous explanation' becomes 've' (I can't explain this - if you can you should believe this answer much more).
'provided by' says to put letters next to each other.
'brand' becomes 'make' (synonyms).
'belie'+'ve'='believe'
'believe' put after 'make' is 'MAKE-BELIEVE'.
Can you help me to learn more?
(Other definitions for make-believe that I've seen before include "Fantasy" , "Pretence" .)