Calculate List Sum

You are tasked with completing a Python function calculate_list_sum that takes a list of integers as input and returns the sum of all elements in the list. The provided starter code has an intentional gap where the core logic for accumulation is missing. Your goal is to fill in this missing part to correctly compute and return the total sum.

Example:

calculate_list_sum([1, 2, 3, 4])  # Expected output: 10
calculate_list_sum([])         # Expected output: 0
calculate_list_sum([-1, 5, 2]) # Expected output: 6