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Endorse it for a short period (6)

Ross

I believe the answer is:

second

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'endorse' is the definition.
(I know that endorse can be written as second)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for second that I've seen before include "Support, assist" , "Flash" , "Back (but not first!)" , "Moment; back" , "Short time - back" .)

I've seen this clue in The Irish Times.
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