Daughter is to take care of balloon (7)
I believe the answer is:
distend
'balloon' is the definition.
(I've seen this before)
'daughter is to take care' is the wordplay.
'daughter' becomes 'dis' (I've seen this in other clues).
'is to take' says to put letters next to each other.
'care' becomes 'tend' (I've seen this before).
'dis'+'tend'='DISTEND'
'of' acts as a link.
(Other definitions for distend that I've seen before include "Increase" , "Exaggerate" , "Expand, inflate" , "Cause to swell" , "balloon" .)