Should she pray behind her husband who is clean-shaven and lets his garment hang down below his ankles?

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Check below answers in case you are looking for other related questions:
Ruling on a smoker leading prayers
Should he pray behind one who did not wash his hands again when he washed his arms in wudoo’?

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Related Answers:
The imaam was accused of reciting Qur’aan incorrectly; what is the status of past prayers?
Praying behind ibaadis and innovators
If the imam breaks his wudoo’ or remembers that he broke his wudoo’ whilst praying, it is permissible for him to appoint someone to lead the prayer for him
Ruling on a smoker leading prayers
Should he pray behind one who did not wash his hands again when he washed his arms in wudoo’?

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