Crossword Genius

For these containers there are a number of charges (6)

Ross

I believe the answer is:

crates

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

'for these containers' is the definition.
(crate is a kind of container)

'there are a number of charges' is the wordplay.
I cannot quite see how this works, but
'are' could be 'a' (short for 'are', historical unit of measurement) and 'a' is present in the answer.
'number' could be 'e' (e is a kind of number) and 'e' is found within the answer.
The remaining letters 'crts' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for crates that I've seen before include "Rough wooden boxes" , "Jalopies" , "Packing cases" , "Boxes for shipping goods" .)

I've seen this clue in the Evening Standard.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.