Groom’s celebration in disgusting place inspires a girl to break up (4,5)
I believe the answer is:
stag party
'groom's celebration' is the definition.
'stag party' can be an answer for 'celebration' (I've seen this before). I'm not sure about the 'groom's' bit.
'disgusting place inspires a girl to break up' is the wordplay.
'disgusting place' becomes 'stay' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'inspires' is an insertion indicator (inspire means to breathe in).
'a girl' becomes 'g'.
'to break up' becomes 'part' ('part' can be a synonym of 'break up').
'g'+'part'='gpart'
'stay' enclosing 'gpart' is 'STAG-PARTY'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for stag party that I've seen before include "Do for blokes" , "Rowdy celebration for men only - or deer?" , "Men only social night out" , "A drinking night out for groom-to-be, men only" , "Rollicking night out for men" .)