Insertion in an array involves adding a new element to a specific position in the array. Here's an example implementation of inserting an element into an array in C:

```
#include <stdio.h>

void insert_element(int arr[], int n, int pos, int value) {
	// Shift elements to make space for new element
	for (int i = n-1; i >= pos; i--) {
		arr[i+1] = arr[i];
	}
	// Insert new element
	arr[pos] = value;
}
int main() {
	int arr[10] = {1, 3, 5, 7, 9};
	int n = 5; // number of elements in array
	int pos = 2; // position to insert new element
	int value = 4; // value of new element
	insert_element(arr, n, pos, value);
	n++; // increment number of elements in array
	// Print array after insertion
	for (int i = 0; i < n; i++) {
		printf("%d ", arr[i]);
	}
	return 0;
}
```

In this implementation, the `insert_element()` function takes an array, its length, the position to insert the new element, and the value of the new element as input. The function shifts all elements after the insert position to the right to make space for the new element and then inserts the new element at the specified position. The `main()` function initializes an array and then inserts a new element into it at position 2 with a value of 4. Finally, it prints the array after insertion.

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