Expedient but unorthodox theme to briefing (3,3,4,5)

I believe the answer is:

for the time being

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'expedient but' is the definition.
I can't judge whether this definition defines the answer.

'unorthodox theme to briefing' is the wordplay.
'unorthodox' indicates anagramming the letters.
'theme'+'to'+'briefing'='themetobriefing'
'themetobriefing' is an anagram of 'FOR THE TIME BEING'.

Can you help me to learn more?

(Another definition for for the time being that I've seen is " at the moment".)

I've seen this clue in The Irish Times.

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