Rushes about, losing odd geodes (5)
I believe the answer is:
reeds
'rushes' is the definition.
(I've seen this in another clue)
'losing odd geodes' is the wordplay.
'losing' becomes 're' (I am not sure about this - if you are sure you should believe this answer much more).
'odd' means one should take alternating letters.
The alternate letters of 'geodes' are 'eds'.
're'+'eds'='REEDS'
'about' acts as a link.
Can you help me to learn more?
(Other definitions for reeds that I've seen before include "Stems for pens" , "Water plants" , "Grasses at river's edge" , "Long grasses" , "Thin pieces of cane in musical instruments" .)