Non-democrat lacking way to join a panel (6)
I believe the answer is:
fascia
'panel' is the definition.
(I know that fascia is a type of panel)
'non-democrat lacking way to join a' is the wordplay.
'non-democrat' becomes 'fascist' (fascism is undemocratic).
'lacking' suggests deleting specific letters.
'way' becomes 'st' (abbreviation for street).
'to join' is a charade indicator (letters next to each other).
'fascist' with 'st' taken away is 'fasci'.
'fasci'+'a'='FASCIA'
(Other definitions for fascia that I've seen before include "Detachable (mobile phone) front cover" , "Surface for display; dashboard" , "Shop sign" , "board above shop window" , "Board above a shop with the name" .)