Fall down with course in writing (8)

I believe the answer is:

prolapse

'fall down' is the definition.
(prolapsing is a kind of falling down)

'course in writing' is the wordplay.
'course' becomes 'lap' (**).
'in' indicates putting letters inside.
'writing' becomes 'prose' (I've seen this in other clues).
'lap' going into 'prose' is 'PROLAPSE'.

'with' acts as a link.

(Another definition for prolapse that I've seen is " falling down from a doctor's point of view".)

I've seen this clue in The Times.

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