Bike takes on storm (7)
I believe the answer is:
cyclone
'storm' is the definition.
(I know that cyclone is a type of windstorm)
'bike takes on' is the wordplay.
'bike' becomes 'cycle' (synonyms).
'takes' means one lot of letters goes inside another.
'cycle' placed around 'on' is 'CYCLONE'.
(Other definitions for cyclone that I've seen before include "Violent windstorm" , "Violent storm" , "Typhoon" , "Spiralling wind" , "Whirlwind or twister" .)