Run right away with stamp fixture craze (7)
I believe the answer is:
unhinge
'craze' is the definition.
(thesaurus)
'run right away with stamp fixture' is the wordplay.
'right' becomes 'r' (common abbreviation).
'away' suggests deleting specific letters.
'with' says to put letters next to each other.
'stamp fixture' becomes 'hinge' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'run' with 'r' taken out is 'un'.
'un'+'hinge'='UNHINGE'
Can you help me to learn more?
(Other definitions for unhinge that I've seen before include "Remove a door - or drive insane" , "Make mentally unbalanced" , "Huge inn? (anagram)" , "Throw mind into confusion like loose door" , "Drive demented in huge inn" .)