Patriarch gets key support by radio operator (7)
I believe the answer is:
abraham
'patriarch' is the definition.
(biblical patriarch)
'key support by radio operator' is the wordplay.
'key' becomes 'A' (musical key).
'support' becomes 'bra' (a support for the breasts).
'by' means one lot of letters go next to another.
'radio operator' becomes 'ham' (as in ham radio).
'a'+'bra'+'ham'='ABRAHAM'
'gets' is the link.
(Other definitions for abraham that I've seen before include "Isaac's father" , "Bar a ham from playing the Biblical patriarch" , "Hebrew father of all the Jews" , "Lincoln, perhaps" , "Father of all the Jews (7)" .)