Light article probing origin of little-known seabird (7)
I believe the answer is:
lantern
'light' is the definition.
(lantern is a type of light)
'article probing origin of little-known seabird' is the wordplay.
'article' becomes 'an' (indefinite article).
'probing' is an insertion indicator (probe can mean to make a hole in).
'origin of' suggests taking the first letters.
'known seabird' becomes 'tern' (tern is a kind of seabird. I am not sure about the 'known' bit.).
The first letter of 'little' is 'l'.
'l'+'tern'='ltern'
'an' put within 'ltern' is 'LANTERN'.
Can you help me to learn more?
(Other definitions for lantern that I've seen before include "Top of lighthouse" , "Cased lamp" , "Light held by 26/27 Across" , "outside D [DECORATION]" , "Portable lamp case" .)