Lust ends in transparent cover (7)
I believe the answer is:
shelter
'cover' is the definition.
(thesaurus)
'lust ends in transparent' is the wordplay.
'ends' says to hollow out the word (remove centre letters).
'in' indicates putting letters inside.
'transparent' becomes 'sheer' ('sheer' can be a synonym of 'transparent'**).
'lust' with its middle taken out is 'lt'.
'lt' inserted inside 'sheer' is 'SHELTER'.
(Other definitions for shelter that I've seen before include "Covering that provides protection from the weather" , "Refuge or protective cover" , "Roof" , "Shield as from rain" , "retreat" .)