Take no notice of bombed region (6)
I believe the answer is:
ignore
'take no notice of' is the definition.
(I've seen this before)
'bombed region' is the wordplay.
'bombed' indicates anagramming the letters.
'region' anagrammed gives 'IGNORE'.
(Other definitions for ignore that I've seen before include "'Disregard, overlook (6)'" , "Discount" , "Pass over" , "Cut head off" , "Pay no heed to" .)