Creature giving the human race sporting support (7)
I believe the answer is:
manatee
'creature' is the definition.
(I have seen 'big creature' mean 'manatee' so perhaps 'creature' could also mean 'manatee')
'giving the human race sporting support' is the wordplay.
'giving' says to put letters next to each other.
'the human race' becomes 'man' (synonyms).
'sporting' becomes 'a' (I can't explain this - if you can you should give a lot more credence to this answer).
'support' becomes 'tee' (tee is a kind of support).
'man' put next to 'a' is 'mana'.
'mana'+'tee'='MANATEE'
Can you help me to learn more?
(Other definitions for manatee that I've seen before include "Large swimmer" , "To find sea cow" , "big creature" , "A neat me (anag) - large aquatic mammal" , "water animal" .)