Chosen to embrace ultimate in cool, as the Gherkin might be? (7)
I believe the answer is:
pickled
'as the gherkin might be?' is the definition.
(as in a pickled gherkin)
'chosen to embrace ultimate in cool' is the wordplay.
'chosen' becomes 'picked' (picking is a kind of choosing).
'to embrace' means one lot of letters goes inside another.
'ultimate in' says to take the final letters.
The final letter of 'cool' is 'l'.
'picked' enclosing 'l' is 'PICKLED'.
(Other definitions for pickled that I've seen before include "Preserved in liquid" , "Preserved - drunk" , "Brahms and Liszt" , "Blotto" , "Drunk (as a gherkin?)" .)