Daisy: elderly relative endlessly swigging beer, embarrassingly (7)
I believe the answer is:
Here is my best explanation:
'daisy' is the definition.
(type of daisy)
'elderly relative endlessly swigging beer embarrassingly' is the subsidiary indication.
'elderly relative' becomes 'gran'.
'endlessly' means to remove the last letter.
'swigging' means one lot of letters goes inside another.
'embarrassingly' is an anagram indicator.
'gran' with its final letter removed is 'gra'.
'beer' is an anagram of 'erbe'.
'gra' placed around 'erbe' is 'gerbera'.
(Other definitions for gerbera that I've seen before include "Bright daisy-like plant", "Plant with brightly coloured flowers", "Coloured daisy-like flower", "S. Afr. composite plant (seen in florists)", "Daisy-like flower", "something in the garden", "It's a bloomer" and "Barberton daisy".)