Might one tire of official holding German girl up (7)

I believe the answer is:

flagger

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'might one' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'tire of official holding german girl up' is the wordplay.
I cannot quite understand how this works, but
'tire' could be 'flag' (I've seen this in another clue) and 'flag' is located in the answer.
'german' could be 'ger' (abbreviation) and 'ger' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Independent.

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