Internal regulator's lad checking D-Notice? (4,5)
I believe the answer is:
body clock
'internal regulator's' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'lad checking d-notice?' is the wordplay.
'lad' becomes 'boy' (lad means a young boy).
'checking' indicates putting letters inside (check can mean to control or arrest).
'notice?' becomes 'clock' (I've seen this before).
'boy' placed around 'd' is 'body'.
'body'+'clock'='BODY CLOCK'
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