Run in a straight line (4)

I believe the answer is:

dash

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

This might be a double definition.

'run' is the first definition.
(I know that dash is a type of track event)

'straight line' is the second definition.
'dash' can be an answer for 'line' (thesaurus). I'm not sure about the 'straight' bit.

'in a' acts as a link.

Can you help me to learn more?

(Other definitions for dash that I've seen before include "style" , "Discourage - suggestion - hurry" , "Vivacity" , "instrument panel" , "Hyphen; race" .)

I've seen this clue in The Globe and Mail.

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