Regularly ignored forlorn St Paul's altar hanging (7)
I believe the answer is:
frontal
'altar hanging' is the definition.
(I've seen this before)
'regularly ignored forlorn st paul's' is the wordplay.
'regularly ignored' means one should take alternating letters.
'forlorn'+'st'+'pauls'='forlornstpauls'
The alternate letters of 'forlornstpauls' are 'FRONTAL'.
(Other definitions for frontal that I've seen before include "Decorative church item" , "altar covering" , "Relating to the forehead" , "Altar hanging" , "Direct and forceful" .)