What does the cryptic crossword clue "Hang-up about direction of rocket science (2-4)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Hang-up about direction of rocket science (2-4)

Guardian Cryptic #24932 | 18 Across | 2010-02-12

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