Bird in quantity of film after holiday cut short (6)
I believe the answer is:
toucan
'bird' is the definition.
(toucan is a kind of bird)
'quantity of film after holiday cut short' is the wordplay.
I cannot really understand how this works, but
'quantity' could be 'can' (can is a kind of quantity) and 'can' is found within the answer.
'of' could be 'o' and 'o' is present in the answer.
This explanation may well be incorrect...
'in' acts as a link.
Can you help me to learn more?
(Other definitions for toucan that I've seen before include "Bird with large, colourful bill" , "Tropical American bird with immense beak" , "A pair could be able for this bird, by the sound of it" , "exotic bird" , "Tropical bird with large bill" .)