People calling for very close matches (7)
I believe the answer is:
ringers
I believe this clue is a double definition.
'people calling' is the first definition.
(people making phone calls)
'very close matches' is the second definition.
(a ringer for someone looks like them)
'for' is the link.
(Other definitions for ringers that I've seen before include "musicians?" , "Impostors (sl)" , "Doubles" , "Campanologists" .)