Bloomer showed up, leading to one-all game (8)
I believe the answer is:
camellia
'bloomer' is the definition.
(type of plant, something which blooms)
'showed up leading to one-all game' is the wordplay.
'showed up' becomes 'came' (to show up is to come or attend).
'leading to' is a charade indicator (letters next to each other) (some letters go before or lead others).
'one' becomes 'I' (Roman numeral).
'game' is an anagram indicator (solving anagrams is a game).
'i'+'all'='iall'
'iall' is an anagram of 'llia'.
'came'+'llia'='CAMELLIA'
(Other definitions for camellia that I've seen before include "Email Cal about the flowering shrub" , "Showy evergreen shrub" , "Flowering plant related to tea" , "Claim ale from the flowering shrub" , "Make the flower from strange lace mail" .)