Ruddy beetroot's top coming into view (8)
I believe the answer is:
blooming
'ruddy' is the definition.
(thesaurus)
'beetroot's top coming into view' is the wordplay.
'top' indicates taking the first letters.
'coming into view' becomes 'looming' ('loom' can be a synonym of 'come into view').
The initial letter of 'beetroot' is 'b'.
'b'+'looming'='BLOOMING'
(Other definitions for blooming that I've seen before include "Healthy -- flowering" , "Euphemistic expletive - in flower" , "Blossoming" , "Looking healthy" .)