Massive re-launch organised around the end of June (9)
I believe the answer is:
herculean
'massive' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I can't see?
're-launch organised around the end of june' is the wordplay.
'organised' indicates anagramming the letters.
'around' is an insertion indicator.
'the end of' suggests the final letters.
The last letter of 'june' is 'e'.
're'+'launch'='relaunch'
'relaunch' with letters rearranged gives 'herculan'.
'herculan' going around 'e' is 'HERCULEAN'.
Can you help me to learn more?
(Other definitions for herculean that I've seen before include "Colossal" , "for Poirot?" , "So enormous a task" , "Monumental (task)" , "Old Labour" .)