All together it's hot at '22 hearing (2,4)
I believe the answer is:
in toto
'all' is the definition.
(thesaurus)
'together it's hot at '22 hearing' is the wordplay.
I cannot quite understand how this works, but
'hot' could be 'in' (both can mean fashionable) and 'in' is found within the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for in toto that I've seen before include "overall" , "In entirety" , "All told" , "As a whole (Latin)" , "Tranquillity" .)