Cricket skipper sent up: too right! (4)
I believe the answer is:
root
'cricket skipper' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'sent up too right' is the wordplay.
'sent up' says the letters should be written backwards.
'right' becomes 'r' (common abbreviation).
'too'+'r'='toor'
'toor' in reverse letter order is 'ROOT'.
Can you help me to learn more?
(Other definitions for root that I've seen before include "Reptile" , "burrow" , "Turn up with the snout." , "Rummage, origin" , "Underground part of a plant" .)