Temporarily assign support? It depends how you say it (6)

I believe the answer is:

second

I'm a little stuck... Click here to teach me more about this clue!

'temporarily assign' is the definition.
'second' can be an answer for 'assign' (thesaurus). I am not certain of the 'temporarily' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for second that I've seen before include "Short time; attendant at a duel" , "Basic unit of time" , "additional > support" , "Not first team (6,6) - See 25" , "Support, assist" .)

I've seen this clue in The Irish Times.

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