Love helping to support bustle (9)
I believe the answer is:
adoration
'love' is the definition.
(to adore someone is to love them)
'helping to support bustle' is the wordplay.
'helping' becomes 'ration' (a ration is a serving or helping).
'to support' means one lot of letters go next to another (in a down clue, some letters hold up others).
'bustle' becomes 'ado' (synonyms).
'ration' after 'ado' is 'ADORATION'.
(Other definitions for adoration that I've seen before include "Not a radio (anag.)" , "high regard" , "Feeling of profound love" , "praise" , "passionate allegiance" .)