Solution for 23 April cryptic crossword clue

An opportunist, a doctor accepting dare (10)

Solution – adventurer

An adventurer could be said to be a type of opportunist.

The second half of the clue is “a doctor” in this case a + dr.

Those letters “accept” a word meaning dare – in this case venture.

So a + d+ venture + r

This is an example of a container clue.  For a more detailed discussion of container clues, click here