Daisy exhausted, riding bicycle initially in wrong gear (7)
I believe the answer is:
gerbera
'daisy' is the definition.
(type of daisy)
'exhausted riding bicycle initially in wrong gear' is the wordplay.
'initially' indicates taking the first letters.
'in' is an insertion indicator.
'wrong' is an anagram indicator.
The first letters of 'exhausted riding bicycle' is 'erb'.
'gear' with letters rearranged gives 'gera'.
'erb' put within 'gera' is 'GERBERA'.
(Other definitions for gerbera that I've seen before include "Coloured daisy-like flower" , "something in the garden" , "Bright daisy-like plant" , "S. Afr. composite plant (seen in florists)" , "Plant with brightly coloured flowers" .)