27 across
Casanova
gets
a
new
top
for
chemical
solution
(7)
Casanova gets a new top for chemical solution (7)
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The definition is at the end of the clue.
How the clue works
The definition is chemical solution, a reducer being a reducing agent used in chemistry and photography. Casanova gives SEDUCER, which 'gets a new top' — its first letter S is swapped for R to make REDUCER.