Cover tailored clothing line in clingy material (6)
I believe the answer is:
velcro
'clingy material' is the definition.
'cover tailored clothing line' is the wordplay.
'tailored' is an anagram indicator (the letters are customised ).
'clothing' means one lot of letters goes inside another.
'line' becomes 'l'.
'cover' anagrammed gives 'vecro'.
'vecro' going around 'l' is 'VELCRO'.
'in' is the link.
(Other definitions for velcro that I've seen before include "Clothes fastener of two pieces of cloth that stick" , "Modern fastening material in clover" , "Invention for making fast" , "Fastening tape" , "Fastener with tiny hooked threads" .)