Friendly face seen beside choir regularly (7)
I believe the answer is:
cordial
'friendly' is the definition.
('cordial' can be similar in meaning to 'friendly')
'seen beside choir regularly' is the wordplay.
'seen' becomes 'dial' (I can't justify this - if you can you should believe this answer much more).
'beside' says to put letters next to each other (I've seen this in other clues).
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'choir' are 'cor'.
'dial' after 'cor' is 'CORDIAL'.
'face' acts as a link.
Can you help me to learn more?
(Other definitions for cordial that I've seen before include "7 [HEARTY]" , "drink with a fruity flavour" , "Warmly welcoming to the drink" , "Hearty - drink" , "Warm and friendly; drink" .)