Temporarily transfer back subordinate (6)

I believe the answer is:

second

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I believe this clue is a triple definition!

'temporarily transfer' is the first definition.
'second' can be an answer for 'transfer' (I've seen this before). I am not certain of the 'temporarily' bit.

'back' is the second definition.
(both can mean to support an idea or proposal)

'subordinate' is the third definition.
(thesaurus)

Can you help me to learn more?

(Other definitions for second that I've seen before include "taking silver back" , "tick" , "additional > support" , "Short period of time" , "Back (but not first!)" .)

I've seen this clue in The Guardian.

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