To clear something away or clear something up
Encoding Strategies:
mnemonic

disperse
to scatter / clear
+
-ar
verb suffix
Despejar means to clear and sounds like the English word disperse0, since when you disperse something, you clear it away.
despejar
to clear, to clear up
To physically clear something away.
Los bomberos despejaron la carretera tras el accidenteThe firefighters cleared the road after the accident
Despeja la mesa antes de comerClear the table before eating
to clear up, to clarify
To clear up obstructions in understanding, such as doubts, confusion, or unknowns.
El profesor despejó todas mis dudasThe teacher cleared up all my doubts
Necesito que me despejes esta confusiónI need you to clarify this confusion for me
despejarse
to clear one's head, to wake up (from grogginess)
To clear oneself of mental obstructions like mental fog and tiredness.
Salí a caminar para despejarme un pocoI went for a walk to clear my head
Tómate un café para despejarteHave a coffee to wake up