Blend of fragrances around garden regularly advanced (4,4)
I believe the answer is:
earl grey
'blend of fragrances' is the definition.
(fragrant tea)
'around garden regularly advanced' is the wordplay.
'around' indicates putting letters inside.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'advanced' becomes 'early' (I've seen this before).
The alternate letters of 'garden' are 'gre'.
'gre' inserted within 'early' is 'EARL GREY'.
(Other definitions for earl grey that I've seen before include "brew" , "A type of China tea flavoured with bergamot" , "leaves a lot to be desired?" , "Tea named after British prime minister" , "Type of 22 across" .)