Roof support with no front behind (5)

I believe the answer is:

after

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'behind' is the definition.
(eg after or behind someone in a queue)

I can't explain the rest of the clue.

(Other definitions for after that I've seen before include "At a later time or behind" , "Looking for" , "Coming later in time" , "Following - behind" , "Subsequent to" .)

I've seen this clue in The Times.

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