Do return on time in charge of teeth (7)
I believe the answer is:
odontic
'teeth' is the definition.
The definition and answer are not the same part of speech.
'do return on time in charge' is the wordplay.
'return' says the letters should be written backwards.
'time' becomes 't' (abbreviation).
'in charge' becomes 'ic' (abbreviation for 'in charge').
'do' back-to-front is 'od'.
'od'+'on'+'t'+'ic'='ODONTIC'
'of' acts as a link.
Can you help me to learn more?
(Another definition for odontic that I've seen is " Dental; of, or to do with, teeth".)