Base for a batch crossword clue

 The answer to the crossword clue "Base for a batch" is lot.

A lot is a group of things that are considered together. In the context of a batch, a lot is the base or foundation on which the batch is created. For example, a batch of cookies might be made from a lot of flour, sugar, eggs, and butter.

Here are some other words that could work for this crossword clue:

set

group

collection

assortment

accumulation

I hope this helps! Let me know if you have any other questions.