Flourish, but see deprivation amidst returning rabble (7)
I believe the answer is:
blossom
'flourish' is the definition.
(thesaurus)
'see deprivation amidst returning rabble' is the wordplay.
'see deprivation' becomes 'loss' ('loss' can be a synonym of 'deprivation').
'amidst' is an insertion indicator.
'returning' says the letters should be written in reverse.
'rabble' becomes 'mob' ('mob' can be a synonym of 'rabble').
'mob' written backwards gives 'bom'.
'loss' going into 'bom' is 'BLOSSOM'.
'but' is the link.
(Other definitions for blossom that I've seen before include "Flowers on tree or bush" , "Mass of flowers - mature" , "Produce flowers" , "Bloom" , "Develop promisingly" .)