Make lovable teens dye hair regularly (6)
I believe the answer is:
endear
'make lovable' is the definition.
('endear' can be a synonym of 'make lovable')
'teens dye hair regularly' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'teens'+'dye'+'hair'='teensdyehair'
The alternating letters of 'teensdyehair' are 'ENDEAR'.
(Other definitions for endear that I've seen before include "Make popular" , "Attract" , "Draw" , "Make appeal" , "Make lovable or please" .)