Sprinted extremely gracefully, having long legs (5)
I believe the answer is:
rangy
'long legs' is the definition.
'rangy' can be an answer for 'long' (thesaurus). I'm not certain of the 'legs' bit.
'sprinted extremely gracefully' is the wordplay.
'sprinted' becomes 'ran' (I've seen this before).
'extremely' suggests removing the centre (only the extremes of the word are used).
'gracefully' with its centre taken out is 'gy'.
'ran'+'gy'='RANGY'
'having' acts as a link.
Can you help me to learn more?
(Other definitions for rangy that I've seen before include "Having members at length" , "Antipodean mountain" , "with long legs" , "Long-legged" , "Tall and thin" .)