Fell runner occasionally stopped around entrance to valley (9)

I believe the answer is:

nosedived

I'm a little stuck... Click here to teach me more about this clue!

'fell runner' is the definition.
The answer and definition can be both to do with motion as well as being past participle verbs.
Maybe you can see a link between them that I don't see?

'occasionally stopped around entrance to valley' is the wordplay.
'occasionally' becomes 'nose' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'stopped' becomes 'died' (I've seen this in another clue).
'around' means one lot of letters goes inside another.
'entrance to' indicates taking the first letters.
The initial letter of 'valley' is 'v'.
'died' placed around 'v' is 'dived'.
'nose'+'dived'='NOSEDIVED'

Can you help me to learn more?

(Another definition for nosedived that I've seen is " plummeted".)

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.