Crossword for SMART People

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Across
  1. 3. Needed to pay for goods you want to buy (M)
  2. 4. What a clock tells you (T)
  3. 5. In high demand but not readily available (R)
  4. 8. Something that you can do (A)
Down
  1. 1. Something that relates to one certain thing (S)
  2. 2. When you do something when asked to (T)
  3. 3. This tells you the size of something (M)
  4. 6. A word that describes a thing (S)
  5. 7. Relevant to real-life (R)