Ate hastily — result of injury to mouth? (7)

'ate hastily' is the definition.
('gobble' can be a synonym of 'eat hastily')

'injury to mouth?' is the wordplay.
'injury' becomes 'bled' (I am not sure about this - if you are sure you should believe this answer much more).
'to' says to put letters next to each other (I've seen this in other clues).
'mouth?' becomes 'gob' (informal term for the mouth).
'bled' put after 'gob' is 'GOBBLED'.

'result of' acts as a link.