Briefly wears what is put out in store? (5,2)
I believe the answer is:
tries on
'briefly wears' is the definition.
(as in wearing clothing to try it on)
'put out in store?' is the wordplay.
'put out' is an anagram indicator.
'in'+'store'='instore'
'instore' with letters rearranged gives 'TRIES ON'.
'what is' is the link.
(Other definitions for tries on that I've seen before include "tests" , "Dons clothes in shop" .)