Sports equipment demonstrated adventurous streak in women's organisation (5,3)
I believe the answer is:
water ski
'sports equipment' is the definition.
'adventurous streak in women's organisation' is the wordplay.
'adventurous' indicates an anagram (an unusual or adventurous form of the letters).
'in' means one lot of letters goes inside another.
'women's organisation' becomes 'wi' (abbreviation for Women's Institute).
'streak' with letters rearranged gives 'atersk'.
'atersk' put inside 'wi' is 'WATER-SKI'.
'demonstrated' acts as a link.
(Other definitions for water ski that I've seen before include "slide over lake, say?" , "Aquaplane as a sport" .)