See female awfully fit finally carry half a ton! (5)
I believe the answer is:
fifty
'half a ton' is the definition.
('ton' can mean a hundred)
'see female awfully fit finally carry' is the wordplay.
'see female' becomes 'f' (abbreviation).
'awfully' is an anagram indicator.
'finally' indicates one should take the final letters.
The last letter of 'carry' is 'y'.
'fit' is an anagram of 'ift'.
'f'+'ift'+'y'='FIFTY'
(Other definitions for fifty that I've seen before include "Half-century" , "L" , "A multiple of ten" .)