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Can anyone help with 3 clues which have stumped me?
3d: Quite attentive to personal hygiene (5) C***N
11d: A storage unit with two round feet? (5) I*M*I - looks like IAMBI, but why?
13a: Net profit finally extracted to void margins. (5) T*L**

13 Tulle (net)
(Profi)t (n)ulle(d)

11 ii (2) around amb (around)

https://www.thefreedictionary.com/Amb-

3 clean double def: quite, attentive to personal hygiene

Thanks scorpiojo. I had virtually come to that conclusion but could not parse it.