Many adopting universal yoga position (5)
I believe the answer is:
lotus
'yoga position' is the definition.
(I've seen this before)
'many adopting universal' is the wordplay.
'many' becomes 'lots' (I've seen this before**).
'adopting' means one lot of letters goes inside another.
'universal' becomes 'u'.
'lots' going around 'u' is 'LOTUS'.
(Other definitions for lotus that I've seen before include "One of the lilies" , "Water-lily; yoga position" , "reason for indolence" , "Kind of cross-legged position for meditation" , "Mythical fruit inducing dreamy state" .)