Hug doctor stopping crazy rush for lozenge (7)
I believe the answer is:
rhombus
'lozenge' is the definition.
(I know that lozenge can be written as rhombus)
'hug doctor stopping crazy rush' is the wordplay.
'hug' becomes 'o' (O can represent a hug in written messages).
'doctor' becomes 'mb' (Bachelor of Medicine, Medicinae Baccalaureus).
'stopping' indicates putting letters inside (stopping can mean blocking a gap).
'crazy' indicates anagramming the letters.
'o'+'mb'='omb'
'rush' is an anagram of 'rhus'.
'omb' inserted inside 'rhus' is 'RHOMBUS'.
'for' acts as a link.
(Other definitions for rhombus that I've seen before include "Equilateral 3" , "4-sided figure" , "Quadrilateral with four equal sides" , "Four-sided figure" , "Special case of parallelogram" .)