Rushes about in tweeds, half-cut (5)
I believe the answer is:
reeds
'rushes' is the definition.
(I've seen this in another clue)
'about in tweeds half-cut' is the wordplay.
'about in' becomes 're' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'half cut' indicates taking half.
'tweeds' with half the letters taken is 'eds'.
're'+'eds'='REEDS'
Can you help me to learn more?
(Other definitions for reeds that I've seen before include "Stems for pens" , "Plants providing thatching material" , "Stops" , "Waterside plants" , "Tall water grasses on lake shore" .)