Past research showed that high self-concept clarity (SCC)—the extent to which self-beliefs are clearly and confidently defined, internally consistent, and stable—predicted positive goal striving outcomes. Moreover, support from close others benefited goal outcomes of low self-concept clarity individuals, but undermined those of high self-concept clarity individuals. The present study studies the progress vs. commitment goal framework as a mechanism that explains the differential effect support has on the relationship between self-concept clarity and goal striving. During the 15-minute online Qualtrics study, participants were randomly manipulated with either high or low self-concept clarity, responded to progress and commitment goal framework measures, asked to imagine either goal support from their best friend (support condition) or doing laundry (neutral condition), and indicated their choice to complete an effortful goal-planning strategy—WOOP (Wish, Outcome, Obstacle, Plan). We found that high (vs. low) self-concept clarity led participants to more likely make sufficient progress towards their goals, and commit to their goals. That is, high self-concept clarity predicted both progress and commitment frameworks. Moreover, progress framework mediated the relationship between self-concept clarity and goal striving, though only for individuals who received support from the friend. We found a nonsignificant relationship between self-concept clarity and goal striving, a nonsignificant mediation effect of goal framework, a nonsignificant moderation effect of support. Discussion highlights a positive effect of high self-concept clarity on commitment framework and progress framework, and a potential of support to foster goal pursuit.