Steer straight (6)

I think it could be either:

Which length description are you looking for?:

direct

I believe this is a double definition.

'steer' is the first definition.
(I've seen this before)

'straight' is the second definition.
('direct' is associated in meaning with 'straight')

(Other definitions for direct that I've seen before include "without ambiguity" , "Frank; undeviating" , "Creepy-crawly" , "Straight - guide" , "Moving without changing direction or stopping" .)

I've seen this clue in The Telegraph.

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