Cryptic crossword clue
Source of bird seed, kilo lost from bursting granary sacks 11

The most common and most likely answer to this crossword clue is the 11 letter word CANARYGRASS

C
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N
A
R
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G
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S

Buddy explains!

The straight part
We know that "Source of bird seed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case source of bird seed = canarygrass.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does CANARYGRASS mean?

CANARYGRASS noun
  1. Phalaris canariensis, a grass whose seeds are used as birdseed

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