Crossword Genius

Frothy stuff in bird's hole in the ground (6,4)

Ross

I believe the answer is:

cuckoo spit

'frothy stuff' is the definition.
(cuckoo spit is a frothy substance)

'bird's hole in the ground' is the wordplay.
'bird's' becomes 'cuckoos' (cuckoo is a kind of bird).
'hole in the ground' becomes 'pit' (pit is a kind of hole in the ground).
'cuckoos'+'pit'='CUCKOO-SPIT'

'in' acts as a link.

(Other definitions for cuckoo spit that I've seen before include "Protective froth secreted by froghopper larvae" , "affording protection for insects" .)

I've seen this clue in The Guardian.
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