Rising depression about love for material (4)
I believe the answer is:
wool
'material' is the definition.
(wool is a kind of material)
'rising depression about love' is the wordplay.
'rising' says the letters should be written backwards (going up in a down clue).
'depression' becomes 'low' (synonyms).
'about' indicates putting letters inside.
'love' becomes 'o' (love means zero in tennis).
'low' placed around 'o' is 'loow'.
'loow' in reverse letter order is 'WOOL'.
'for' is the link.
(Other definitions for wool that I've seen before include "Hair of sheep etc" , "Fabric from fleece" , "Sheep coat" , "Fabric made from animal hair" , "Fleece of sheep" .)