Bishop with crowd standing beside church yard in an irregular form (7)
I believe the answer is:
blotchy
'in an irregular form' is the definition.
(covered in blotches or patches)
'bishop with crowd standing beside church yard' is the wordplay.
'bishop with' becomes 'b' (I've seen this in other clues).
'crowd' becomes 'lot' (I've seen this in other clues).
'standing beside' means one lot of letters go next to another.
'church' becomes 'ch' (common abbreviation).
'yard' becomes 'y' (abbreviation).
'b'+'lot'+'ch'+'y'='BLOTCHY'
(Other definitions for blotchy that I've seen before include "Discoloured in patches" , "Unevenly stained" , "Marked with patches" , "With irregular skin discolouration" .)