Love cocaine and speed (5)
I believe the answer is:
crush
'love' is the definition.
(crush is a kind of love)
'cocaine and speed' is the wordplay.
'cocaine' becomes 'C' (drugs abbreviation).
'and' says to put letters next to each other.
'speed' becomes 'rush' (synonyms).
'c'+'rush'='CRUSH'
(Other definitions for crush that I've seen before include "Fruit drink; crowd" , "Intense infatuation; pressing crowd" , "stampede" , "Suppress - infatuation" , "Steamroller" .)