Bidirectional (3-3)

I think it could be either:

Which length description are you looking for?:

3-3

two-way

'bidirectional' is the definition.
(similar in meaning)

This is all the clue.

(Other definitions for two-way that I've seen before include "Involving movement in either direction" , "Involving reciprocation" .)

I've seen this clue in The Times and the Universal.

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