Hotel boss going crazy to find mass supplier (5,5)
I believe the answer is:
'mass supplier' is the definition.
(particle responsible for mass)
'hotel boss going crazy' is the wordplay.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'crazy' is an anagram indicator.
'bossgoing' is an anagram of 'iggsboson'.
'to find' acts as a link.
(Another definition for higgs boson that I've seen is " [ELEMENTARY PARTICLE] yet to be confirmed".)