Grow quickly, providing benefit everyone participates in (7)
I believe the answer is:
balloon
'grow quickly' is the definition.
'balloon' can be an answer for 'grow' (thesaurus). I am not sure about the 'quickly' bit.
'benefit everyone participates in' is the wordplay.
'benefit' becomes 'boon' (a boon is a help or benefit).
'everyone' becomes 'all' (all people).
'participates in' is an insertion indicator.
'boon' going around 'all' is 'BALLOON'.
'providing' acts as a link.
Can you help me to learn more?
(Other definitions for balloon that I've seen before include "Air-filled bag" , "Brandy glass" , "Inflatable - rapidly expand" , "Inflatable sphere, may contain hot air" , "One blown up for party" .)