Fields starts a comedy routine every Saturday (5)

I believe the answer is:

acres

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

'fields starts' is the definition.
'acres' can be an answer for 'fields' (I've seen this in another clue). I'm not certain of the 'starts' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for acres that I've seen before include "Scare (anag)" , "One of them has 4840 square yards" , "Cares about the land measures" , "Land area measures" , "farmland maybe?" .)

I've seen this clue in the Sydney Morning Herald.

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