17 across
Earliest
of
begonias
continued
blooming
(7)
Earliest of begonias continued blooming (7)
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The definition is at the end of the clue.
How the clue works
Look at blooming — that's your definition, used here as a mild expletive meaning 'blasted'. For the wordplay, take B, the earliest (first) letter of begonias, and stick it in front of lasted (continued).