You Might Be Said to Have an Ace Up This

This page is the CodyCross answer for the clue below from Working From Home, Group 1232, Puzzle 5 (Posture Corrector).

Question is: You Might Be Said to Have an Ace Up This

and the answer is: SLEEVE

Word Meaning:

SLEEVE — The part of a garment that covers the arm.

Definitions from Wiktionary.