Bit of a cover-up of boobs by some flipping topless attendant (6)
I believe the answer is:
tassel
'bit of a cover-up of boobs' is the definition.
(as in a nipple tassel)
'some flipping topless attendant' is the wordplay.
'flipping' says the letters should be written in reverse.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'lessat' can be found hidden inside 'topless attendant'.
'lessat' in reverse letter order is 'TASSEL'.
'by' is the link.
(Other definitions for tassel that I've seen before include "male hawk" , "Bunch of cords fastened at one end" , "Ornamental hanging tuft" , "Hanging ornament" , "Decorative ending to a cord" .)