High pressure infatuation (5)
I believe the answer is:
crush
This could be a double definition.
'high pressure' is the first definition.
'crush' can be an answer for 'pressure' (thesaurus). I'm not sure about the 'high' bit.
'infatuation' is the second definition.
(I know that infatuation can be written as crush)
Can you help me to learn more?
(Other definitions for crush that I've seen before include "Close crowd; drink" , "Adolescent's temporary love" , "Close crowd of people" , "Squash" , "Suppress - infatuation" .)