Many are parched by the heat (6)
I believe the answer is:
sundry
'many' is the definition.
(thesaurus)
'parched by the heat' is the wordplay.
'parched' becomes 'dry' (similar in meaning).
'by' says to put letters next to each other.
'the heat' becomes 'sun' (I am not sure about this - if you are sure you should believe this answer much more).
'dry' put after 'sun' is 'SUNDRY'.
'are' is the link.
Can you help me to learn more?
(Other definitions for sundry that I've seen before include "Various, assorted" , "All and . . . . . . includes everyone" , "more than a couple" , "Several, separate, miscellaneous" , "All and . . . . . . - various or several" .)