Huge bird I can corrupt (7)
I believe the answer is:
titanic
'huge' is the definition.
(I've seen this before)
'bird i can corrupt' is the wordplay.
'bird' becomes 'tit' (tit is a kind of bird).
'corrupt' indicates anagramming the letters.
'i'+'can'='ican'
'ican' anagrammed gives 'anic'.
'tit'+'anic'='TITANIC'
(Other definitions for titanic that I've seen before include "Ship that sank in 1912" , "Sinker" , "Extremely large" , "Gigantic like doomed ocean liner" , "Very big and powerful" .)