They clean the cheap seats (9)

I believe the answer is:

bleachers

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

'cheap seats' is the definition.
(I've seen this in another clue)

'they clean' is the wordplay.
I cannot really understand how this works, but
'clean' could be 'bleach' (I've seen this before) and 'bleach' is found in the answer.
The remaining letters 'ers' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'the' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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