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Can anyone explain this one to me, please?
40dn Does put time in to opening barrier(9)
I have D_T_R_E_T. It looks like deterrent, which is a barrier, but I can't make the beginning of the clue work.

de(t)er/rent

t in deer(does - female deer)
rent is opening

Thanks again, ixion. This is not the first time you have helped me. I have already posted my crossword, but I like to understand each clue. The forum is a great help.