Bird runs into the long grass (5)
I believe the answer is:
crane
'bird' is the definition.
(I know that crane is a bird)
'runs into the long grass' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'into' is an insertion indicator.
'the long grass' becomes 'cane' (I can't justify this - if you can you should give a lot more credence to this answer).
'r' placed into 'cane' is 'CRANE'.
Can you help me to learn more?
(Other definitions for crane that I've seen before include "Lifting device; stretch (neck)" , "American writer" , "Hoist; wading bird" , "Device for picking up" , "Wading bird to lift heavy objects?" .)