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Conducted
lessons
in
English,
with
students
covering
tenses
–
one
might
appear
with
a
smile
(5,4)
Conducted lessons in English, with students covering tenses – one might appear with a smile (5,4)
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The definition is at the end of the clue.
How the clue works
The answer is one might appear with a smile. Start with TAUGHT (conducted lessons) and swap its two T's (tenses) for two L's (students, as in learners), giving LAUGHL, then add IN (in) and E (abbreviation for English) to build LAUGHLINE, which splits as LAUGH LINE.