Back in a moment (6)

I believe the answer is:

second

I believe this clue is a double definition.

'back' is the first definition.
('second' can be a synonym of 'back')

'a moment?' is the second definition.
('second' can be a synonym of 'moment')

'in' acts as a link.

(Other definitions for second that I've seen before include "Assistant in the ring" , "Support - runner-up" , "Time for a supporter" , "Short period of time" , "A duellist's or boxer's assistant" .)

I've seen this clue in The Sun, The Globe and Mail, The Guardian and The Telegraph.

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