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10a.4lets.?t?n.Architect rejected thinner window frames.
11d.12lets.?e?????n???n.Critical words about guest house in which woman's put up.
16d.9lets.R???i???r.Jogger maybe goes without a rest.14d.10lets.?p?o?t???s.Shares collapsing in Spain --- poor investment ultimately.

10 Wren (architect, hidden (backwards) in clue)

16 Remainder (reminder/jogger+a)

Thanks Malone.

11 Reprehension
14 Apportions (anangram of 'spain poor'+ the 't' from the end (ultimately) of 'investment'.

Thanks again Malone .

You're very welcome - I did this crossword earlier today, so only had to check my own answers.