Glean this is one of a host (5)
I believe the answer is:
angel
'one of a host' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'glean this' is the wordplay.
'glean' anagrams to 'ANGEL'.
But, I'm not clear how the anagram is indicated.
'is' is the link.
Can you help me to learn more?
(Other definitions for angel that I've seen before include "Theatrical backer" , "Theatre supporter" , "local to Islington" , "Winged messenger" , "lady (very kind)" .)