So bats can change into crows! (6)
I believe the answer is:
boasts
'crows' is the definition.
(I've seen this before)
'so bats can change' is the wordplay.
'can change' indicates an anagram.
'so'+'bats'='sobats'
'sobats' anagrammed gives 'BOASTS'.
'into' acts as a link.
(Other definitions for boasts that I've seen before include "Brags in praise of oneself" , "crows" , "Brags, blows" , "Blows one's own trumpet" , "Brags, shows off" .)