One might let aircraft cleaner regularly clear out their gear (9)

I believe the answer is:

charterer

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'one might let' is the definition.
The definition suggests a singular noun which matches the answer.

'aircraft cleaner regularly clear out their gear' is the wordplay.
I cannot really see how this works, but
'cleaner' could be 'char' (charwoman is a type of cleaner) and 'char' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.

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