A New Testament colonist (3)

I believe the answer is:

ant

'colonist' is the definition.
(ants live in colonies)

'a new testament' is the wordplay.
'new testament' becomes 'nt'.
'a'+'nt'='ANT'

(Other definitions for ant that I've seen before include "one living in colonies" , "Worker on the hill" , "Small busy insect" , "Colonial insect?" , "that may be a soldier" .)

I've seen this clue in The Globe and Mail.

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