Swallow or martin consuming other birds' food? (4)
I believe the answer is:
worm
'consuming other birds' food?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'swallow or martin' is the wordplay.
'WORM' is hidden in amongst the letters.
But, I am unsure how this is indicated.
Can you help me to learn more?
(Other definitions for worm that I've seen before include "one leaving cast" , "Insect larva" , "Annelid" , "Cylindrical gear; burrowing invertebrate" , "Pink, slimy subterranean wriggler" .)