There are many prepositions that can be used with "working clearance" - 'for', 'on', 'without', etc. Often, a preposition isn't used.
It's best you give us an example on how you want to use "working clearance" to get the right answer.
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Use during with "working clearance "
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'working clearance' is usually a very specific technical phrase. As Greg suggested, please give us the context, so that we can suggest the right preposition, but also check that you have the right phrase.
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