Groan, consumed by obvious lapse (9)
I believe the answer is:
oversight
'lapse' is the definition.
('oversight' can be a synonym of 'lapse')
'groan consumed by obvious' is the wordplay.
'groan' becomes 'sigh' (I've seen this before).
'consumed by' indicates putting letters inside.
'obvious' becomes 'overt' ('overt' can be similar in meaning to 'obvious').
'sigh' put into 'overt' is 'OVERSIGHT'.
(Other definitions for oversight that I've seen before include "Failure to notice - supervision" , "act of negligence" , "Supervision - omission" , "Got shiver due to forgetfulness" , "what supervisor has" .)