At all, with "the"

LEASTBIT

Consider the smallest possible amount when paired with a definite article.

The clue "At all, with 'the'" hints at combining "at all" and "the" to form the answer. "At all" can be interpreted as "least" (meaning minimally) and "bit" (a small amount), while "the" is simply added as-is. Putting them together gives "LEASTBIT," which fits the structure of the clue. The wordplay relies on breaking down the phrase into its components.