Hotel computer equipment is common, is that not the case? (5)
I believe the answer is:
innit
'common is that not the case?' is the definition.
(informal or common version of 'isn't it')
'hotel computer equipment' is the wordplay.
'hotel' becomes 'inn' (inn is a kind of hotel).
'computer equipment' becomes 'it' (abbreviation for Information Technology).
'inn'+'it'='INNIT'
'is' is the link.
(Other definitions for innit that I've seen before include "Common question" , "that produces stress for some" , "word of emphasis" , "Isn't it (sl.)" , "Mere spoken punctuation" .)